OpenLLM-France/wikimedia huggingface dataset:
# Efficiency in computing project/Brainstorming

Suppose we wanted to have a power device, that was efficient. Powerful, but efficient...
What would that look like? ....
GPU/multicore....
    A device... lcd/quasi epaper (glare free) on one side
    solar panel on other
    wifi...
    memory...
    usb... maybe..
    processor...
    power on off button...
    speaker...
    camera...
    weather resistant..
    microphone...
    linux...
    blue tooth..
    accelerometers..
    gps
    hmmm... ... ... .. . .
wimax? cdma?
    light - thin - maybe ~8 x ~6 x =<.25
    durable>
# Effects of Microgravity on Human Physiology

Microgravity, a condition where objects appear to be weightless, profoundly affects the human body. This environment is commonly experienced by astronauts in space, particularly on the International Space Station (ISS). Studying the body's response to microgravity is crucial for ensuring the health and safety of astronauts on long-duration space missions

## Effects on Human Physiology

Heart and Blood Vessel
Microgravity affects the cardiovascular system in several ways. Body fluids shift towards the head, causing facial puffiness, nasal congestion, and potentially increased pressure in the skull, which can affect vision. The heart doesn't work as hard to pump blood, leading to a decrease in heart muscle mass and resulting in orthostatic intolerance, or difficulty standing upright, when astronauts return to Earth due to changes in blood pressure regulation.
Balance and Sensory
Many astronauts experience space motion sickness, including nausea, dizziness, and disorientation, especially during the first few days in space. The vestibular system, responsible for balance, is disrupted, affecting movement and coordination, which means astronauts need to adapt to these changes to perform tasks effectively in space.
Psychological and Behavioral
Living and working in a confined space like the ISS can lead to psychological challenges. Prolonged isolation from family and friends and living in a small space can cause stress and feelings of isolation. Maintaining mental health is crucial, often supported through communication with loved ones and recreational activities. Additionally, the lack of a natural day-night cycle can disrupt sleep patterns, which are managed with light therapy and structured schedules.
Musculoskeletal System
In microgravity, muscles and bones don't need to support the body's weight, leading to several changes. Muscles, especially in the legs and back, weaken and shrink from reduced use, so astronauts need to exercise regularly to maintain muscle mass and strength. Similarly, bones lose minerals and become less dense, a condition called spaceflight osteopenia, which is much more severe than osteoporosis on Earth.

## Sources

- NASA Human Research Program (HRP)
- Article: "The Impact of Long-Duration Spaceflight on the Human Body: Key Physiological Changes"
- Article: "Physiological and Psychological Adaptations of Astronauts During Spaceflight"
# Egg in vinegar experiment

Dissolving an egg shell in vinegar is a classic experiment to do with younger children. If you want less of a mess you can use a hard-boiled egg, but using a raw eggs is a bit cooler; the result of the hard-boiled egg is pretty similar to a peeled hard-boiled egg. This experiment is appropriate for any age.

## Materials

* Two glass cups
* Water
* White vinegar (acetic acid)
* Two eggs

## Form a hypothesis

What do you think will happen to the egg in the vinegar?

## Experiment

Get two clear glasses of the same size. Place an egg in each cup. Fill one glass up with white vinegar.
Fill one glass with water. This is your control.
Check on your eggs periodically. Leave at least 24 hours before removing the eggs from the class.

## Results

What happened to the egg in the vinegar? Was your hypothesis correct?
Why did we put the other egg in water? What other controls could you have used? What did we find out about acids?
# Comparative law and justice/Singapore

Part of the Comparative law and justice Wikiversity Project

## Courts and Criminal Law
### Punishment
### Law Enforcement

Singapore has two categories for authorities. One is the Singapore Police Force, and the other is customs authority. Requirement for the Singapore Police Force includes a physical test, education, and citizenship. Males need to get a grade of A or B of the physical test, which is known as the Physical Employment Status. Females are exempt from this portion. Both genders need at least 5 credits in General Certificate of Education (GCE) in the "O" level. This is equivalent to a United States's high school diploma with a C average. The last requirement to qualify for a police officer is to be a Singaporean or be a Singapore Permanent Resident.

### Crime Rates and Public Opinion

Singapore 's legal system is based on the English Common Law system.

## Rights
### Works Cited

* ↑ http://www.spf.gov.sg/career/po_entry.htm#top
# Differentiable function/D open in K/Chain rule/Fact/Proof

Due to fact, one can write
    $f(x)=f(a)+f'(a)(x-a)+r(x)(x-a)\,$
and
    $g(y)=g(b)+g'(b)(y-b)+s(y)(y-b)\,.$
Therefore,
    ${\begin{aligned}g(f(x))&=g(f(a))+g'(f(a))(f(x)-f(a))+s(f(x))(f(x)-f(a))\\&=g(f(a))+g'(f(a)){\left(f'(a)(x-a)+r(x)(x-a)\right)}+s(f(x)){\left(f'(a)(x-a)+r(x)(x-a)\right)}\\&=g(f(a))+g'(f(a))f'(a)(x-a)+{\left(g'(f(a))r(x)+s(f(x))(f'(a)+r(x))\right)}(x-a).\end{aligned}}$
The remainder function
    $t(x):=g'(f(a))r(x)+s(f(x))(f'(a)+r(x))\,$
is continuous in $a$ with value $0$.
# Differentiable function/R/1 over g 1...g n/Derivation through Induction/Exercise

Let
    $g_{1},g_{2},\ldots ,g_{n}\colon \mathbb {R} \longrightarrow \mathbb {R} \setminus \{0\}$
denote differentiable functions. Prove, by induction over $n$, the relation
    ${\left({\frac {1}{g_{1}\cdot g_{2}\cdots g_{n}}}\right)}^{\prime }={\frac {-1}{g_{1}\cdot g_{2}\cdots g_{n}}}\cdot {\left({\frac {g_{1}'}{g_{1}}}+{\frac {g_{2}'}{g_{2}}}+\cdots +{\frac {g_{n}'}{g_{n}}}\right)}\,.$
# Differentiable function/D open in K/Linear approximation/Fact/Proof

If $f$ is differentiable, then we set
    $s:=f'(a)\,.$
Then the only possibility to fulfill the conditions for $r$ is
    $r(x)={\begin{cases}{\frac {f(x)-f(a)}{x-a}}-s{\text{ for }}x\neq a\,,\\0{\text{ for }}x=a\,.\end{cases}}\,$
Because of differentiability, the limit
    $\operatorname {lim} _{x\rightarrow a,\,x\in D\setminus \{a\}}r(x)=\operatorname {lim} _{x\rightarrow a,\,x\in D\setminus \{a\}}{\left({\frac {f(x)-f(a)}{x-a}}-s\right)}\,$
exists, and its value is $0$. This means that $r$ is continuous in $a$. If $s$ and $r$ exist with the described properties, then for $x\neq a$ the relation
    ${\frac {f(x)-f(a)}{x-a}}=s+r(x)\,$
holds. Since $r$ is continuous in $a$, the limit on the left-hand side, for $x\rightarrow a$, exists.
# Differentiable function/D open in K/Rules/Fact

Let $D\subseteq {\mathbb {K} }$ be a subset, $a\in D$ a point and
    $f,g\colon D\longrightarrow \mathbb {R}$
functions which are differentiable in $a$. Then the following rules for differentiability holds.
* The sum $f+g$ is differentiable in $a$ with
    $(f+g)'(a)=f'(a)+g'(a)\,.$
* The product $f\cdot g$ is differentiable in $a$ with
    $(f\cdot g)'(a)=f'(a)g(a)+f(a)g'(a)\,.$
* For $c\in {\mathbb {K} }$ also $cf$ in $a$ differentiable with
    $(cf)'(a)=cf'(a)\,.$
* If $g$ has no zero in $a$, then $1/g$ is differentiable in $a$ with
    ${\left({\frac {1}{g}}\right)}'(a)={\frac {-g'(a)}{(g(a))^{2}}}\,.$
* If $g$ has no zero in $a$, then $f/g$ id differentiable in $a$ with
    ${\left({\frac {f}{g}}\right)}'(a)={\frac {f'(a)g(a)-f(a)g'(a)}{(g(a))^{2}}}\,.$
# Differentiable function/Mean value theorem/Quotient version/Fact

Let $b>a$, and suppose that
    $f,g\colon [a,b]\longrightarrow \mathbb {R}$
are continuous functions which are differentiable on $]a,b[$ and such that
    $g'(x)\neq 0\,$
for all $x\ina,b$.
$g(b)\neq g(a)$, and there exists some $c\ina,b$ such that
    ${\frac {f(b)-f(a)}{g(b)-g(a)}}={\frac {f'(c)}{g'(c)}}\,.$
# Differentiable function/R/Higher derivatives/Positive/Zeroes/Exercise

Let $f\colon \mathbb {R} \rightarrow \mathbb {R}$ be an $n$-fold continuously differentiable function with the property that its $n$-th derivative is everywhere positive. Show that $f$ has at most $n$ zeroes.
# Differentiable function/D open in K/Rules/Fact/Proof

(1). We write $f$ and $g$ respectively with the objects which were formulated in fact, that is
    $f(x)=f(a)+s(x-a)+r(x)(x-a)\,$
and
    $g(x)=g(a)+{\tilde {s}}(x-a)+{\tilde {r}}(x)(x-a)\,.$
Summing up yields
    $f(x)+g(x)=f(a)+g(a)+(s+{\tilde {s}})(x-a)+(r+{\tilde {r}})(x)(x-a)\,.$
Here, the sum $r+{\tilde {r}}$ is again continuous in $a$, with value $0$. (2). We start again with
    $f(x)=f(a)+s(x-a)+r(x)(x-a)\,$
and
    $g(x)=g(a)+{\tilde {s}}(x-a)+{\tilde {r}}(x)(x-a)\,,$
and multiply both equations. This yields
    ${\begin{aligned}f(x)g(x)&=(f(a)+s(x-a)+r(x)(x-a))(g(a)+{\tilde {s}}(x-a)+{\tilde {r}}(x)(x-a))\\&=f(a)g(a)+(sg(a)+{\tilde {s}}f(a))(x-a)\\&\,\,\,\,\,+(f(a){\tilde {r}}(x)+g(a)r(x)+s{\tilde {s}}(x-a)+s{\tilde {r}}(x)(x-a)+{\tilde {s}}r(x)(x-a)+r(x){\tilde {r}}(x)(x-a))(x-a).\end{aligned}}$
Due to fact for limits, the expression consisting of the last six summands is a continuous function, with value $0$ for $x=a$. (3) follows from (2), since a constant function is differentiable with derivative $0$. (4). We have
    ${\frac {{\frac {1}{g(x)}}-{\frac {1}{g(a)}}}{x-a}}={\frac {-1}{g(a)g(x)}}\cdot {\frac {g(x)-g(a)}{x-a}}\,.$
Since $g$ is continuous in $a$, due to fact, the left-hand factor converges for $x\rightarrow a$ to $-{\frac {1}{g(a)^{2}}}$, and because of the differentiability of $g$ in $a$, the right-hand factor converges to $g'(a)$. (5) follows from (2) and (4).
# Differentiable function/Mean value theorem/Quotient version/Fact/Proof

The statement
    $g(a)\neq g(b)\,$
follows from fact. We consider the auxiliary function
    $h(x):=f(x)-{\frac {f(b)-f(a)}{g(b)-g(a)}}g(x)\,.$
We have
    ${\begin{aligned}h(a)&=f(a)-{\frac {f(b)-f(a)}{g(b)-g(a)}}g(a)\\&={\frac {f(a)g(b)-f(a)g(a)-f(b)g(a)+f(a)g(a)}{g(b)-g(a)}}\\&={\frac {f(a)g(b)-f(b)g(a)}{g(b)-g(a)}}\\&={\frac {f(b)g(b)-f(b)g(a)-f(b)g(b)+f(a)g(b)}{g(b)-g(a)}}\\&=f(b)-{\frac {f(b)-f(a)}{g(b)-g(a)}}g(b)\\&=h(b).\end{aligned}}$
Therefore, $h(a)=h(b)$, and fact yields the existence of some $c\ina,b$ with
    $h'(c)=0\,.$
Rearranging proves the claim.
# Differentiable function/R/Local extrema/Derivative/Introduction/Section
## Theorem

Let
    $f\colona,b\longrightarrow \mathbb {R}$
be a function which attains in $c\ina,b$ a local extremum, and is differentiable there. Then $f'(c)=0$

### Proof

We may assume that $f$ attains a local maximum in $c$. This means that there exists an $\epsilon >0$, such that $f(x)\leq f(c)$ holds for all $x\in [c-\epsilon ,c+\epsilon ]$. Let ${\left(s_{n}\right)}_{n\in \mathbb {N} }$ be a sequence with $c-\epsilon \leq s_{n}<c$, tending to $c$ ("from below“). Then $s_{n}-c<0$, and so $f(s_{n})-f(c)\leq 0$, and therefore the difference quotient
    ${\frac {f(s_{n})-f(c)}{s_{n}-c}}\geq 0\,.$
Due to fact, this relation carries over to the limit, which is the derivative. Hence, $f'(c)\geq 0$. For another sequence ${\left(t_{n}\right)}_{n\in \mathbb {N} }$ with $c+\epsilon \geq t_{n}>c$, we get
    ${\frac {f(t_{n})-f(c)}{t_{n}-c}}\leq 0\,.$
Therefore, also $f'(c)\leq 0$ and thus $f'(c)=0$.
$\Box$
We remark that the vanishing of the derivative is only a necessary, but not a sufficient, criterion for the existence of an extremum. The easiest example for this phenomenon is the function $\mathbb {R} \rightarrow \mathbb {R} ,x\mapsto x^{3}$, which is strictly increasing and its derivative is zero at the zero point. We will provide a sufficient criterion in fact, see also fact.
# Differentiable function/R/Product rule/Function limit/Exercise

Prove the product rule for differentiable functions, using limits of functions, applied to the difference quotient.
# BristleBot Model
## Target Audience

* Children (age 8-16)
Who is suppose to read this: College freshman, in precalc ... never programmed a computer or drawn with 3D software.

## Starting Point

* Google sketchup
* Raspberry

## Replication Goal

* Simulating section of rube goldberg machine with physics add on to Google Sketchup
* Installing ROS on debian on pc

## Procedure format SD card

row of pictures using the gallery wikimedia syntax.
* Step
* Step
* Step
* Step

## Procedure cut Electric Guitar Wire

row of pictures vidoe links showing how to cut wire
* Step
* Step
* Step
* Step
# BrislteBot Model 4: Version 3
## Starting Point

* Get a feel for visual conception by looking at the Previously Improved BristleBot Model 4 Previously Improved BristleBot Model 4
* Derive its features but improve upon them Improved Model: Version 3

## Replication Goal

* Instead of copying the Previously Improved Model, improve its features for the New BristleBot Model 4
* Use household or cheap materials

## Previous Problems

* After a short duration of its activation, the Model moves in a off-course, diagonal direction
** Doesn't maintain its 'forward' motion the whole time
** Its Demonstration
* No creativity in the design still
** Although it wasn't the intention, Model still lacks its creativity in the design.

## Materials

* $1 material's base
* $1 material's motor
* Three brushes
* Double-sided foam tapes
* AA Battery
* Two sets of Velcro
* Athletic tape
* Paper clips

## Procedure: Version 1 (Pics)

* 1. Gather the listed materials
* 2. Bend the paper clip into straight length
* 3. Bend the longest side into L-like shape (Repeat procedures 2 and 3 for another paper clip)
* 4. Tape the 2 paper clips to the side of the Model
* 5. Shift the paper clips based upon its misdirection until it eventually moves into the forward direction

## Procedure: Improved BristleBot Model 4 (Vids)

* Step 1: Bending the paper clips
* Step 2: Attaching the clips onto the Model
* Step 3: Readjusting the clips to promote the forward motion

## New BristleBot Testing

* The demonstration of the Version 3

## Improvements

* Compared to that of Version 1 and Version 2, there is a huge increase in its speed
** The fastest model even with the paper clip attachment
* Not much of a significant improvement still

## More Problems

* The model still doesn't go in a straight line
** It spins off into a circular pattern
* Model's direction couldn't be controlled
** Speed is fine but the direction movement is not satisfactory
** Even if the paper clips could be readjusted, there were no trends of forward motion or any improvements
* Doesn't look too creative
** No improvements on the Model's external features or creative outlook
# Bridge structure

A bridge is a structure to cross an open space or gap. Bridges are mostly useful for crossing rivers, valleys, or roads by vehicles but people have also used bridges for a long time for walking. Bridges called highway overpasses are used to avoid traffic control.
Bridges also have uses in the military. Military bridges have to be portable, so that they may be easily moved to the front lines, and so they are much more complex than regular civilian bridges.

## Types of bridges

There are five major structural types of bridges:
* beam bridges
* cantilever bridges,
* arch bridges
* suspension bridges and
* cable-stayed bridges
# BristleBot Model 1
## Target Audience

* Children (age 8-14) BristleBot Model 1
* Adults (parents/guardians)
** Who would accompany the children to replicate this model

## Starting Point

* Get a feel for visual conception through this Youtube Tutorial Video
** This helps to capture an image of a generic BristleBot Model
* Derive the features for the BristleBot from |Hexbugs

## Replication Goal

* Instead of copying the Youtube Bristlebot, remodel its structure and design based upon the listed materials
** Be creative to gain children's attention and their interests in making this bristlebot
* Like nano hexbugs, the replicated model must move as well
** The vibration caused by the model allows the Bristlebot to move in a direction
** Angle the brush/base so that the model moves forward; not in a loop of random directions

## Materials

* Three 2.5-3 in. nails
* $1 material's motor
* $1 material's brush
* Double-sided foam tapes
* Wires (from the carjack)
* Battery Cell 2072 (Originally used before it died and replaced with AA)

## Procedure: BristleBot Model 1

* 1. Gather the listed Materials
* 2. Nails are attached in the tri-pod shape with the double-sided foam tapes
* 3. Wires from the CarJack are used
* 4. Wires are being attached into the Motor compartment
* 5. The Motor and Brush are attached with the Double-Sided Foam Tapes
* 6. The counterweights and the battery cell are attached to the BristleBot

## BristleBot 1 Testing

* The demonstration of the BristleBot 1
** Due to short-lived battery-cell life, it had been replaced with bigger, much heavier AA battery

## Pro(s)

* Assembly style to create this model
** Each compartment could be replicated by young children by simply stacking each layer on top of each other
*** Bottom = Toothbrush
*** Middle = Motor
*** Top = Counterbalance weight (The nails)
* Resembles the image of a helicopter
** Kids tend to like real-life object that can only be seen in TV or virtual world (like video gaming)

## Con(s)

* Exposure of vibrator
** As the vibrator spins to cause movement, children's hair (especially girls') could be rolled up
** Such example can be found here:
* Sharp nails are required for this model
** It's still dangerous for young kids to build with, even with adults' assistance
* Battery life is incredibly short when 'properly-sized' battery cell is used
** This could be countered with AA battery but, as shown in the Testing video, the model had a balance/stability issue
** Doesn't go 'forward' but rather falls immediately after the motor activation
* There is no 'real switch'
** Tape that is attached onto the free-floating wire doesn't stay attached to the battery to cause movment
** The 'attached' tape immediately falls off or inadequately stays attached as seen in the Testing video
# Engineering Projects/Corn Starch
## Project Cornstarch

Develop all the cornstarch demos:
    Faraday Waves
    Monsters
    QuickSand
Document creation, and clean up processes so pipes are clogged.

## Conceive

Cornstarch Vehicle-T&TH 5:30pm-7:20pm

## Tutorials

old documentation
# Engineering Projects/Corn Starch/Howard Community College/Fall 2011

This section is for team pages doing the Corn Starch project
       501_Speakers
# Engineering Projects/Corn Starch/Howard Community College/fall2012/p1-550-soc/A Walk Through Engineering Project

To Submit Project Proposal
DEADLINE: October 15th at 5:00PM
Respond to the Following by simply editing the page and adding your information at the bottom of the page (make sure to answer all questions, you can number them). Make sure you DO NOT DELETE the Existing Information
1. Name of Project
2. Materials
3. Functions
4. Applications
5. Warnings!!! (Please mention anything of Safety Relevance relating your Project)
6. Pictures (if any)
7. Name/Teammates/Class
# Engineering Projects/Corn Starch/Howard Community College/fall2012/p2-550-ma
### Problem Statement

Fix the cable that was connected to the amplifier, test the oscillator, and connect the oscillator to the speaker.

### Team Members

* Amoh
* Mogren

### Summary

So far, we have been trying to get a general summary of what the previous group has done and what we need to do to move the project forward.

### Story

Over the last couple of classes, we spent time setting up our team pages and our wiki pages. We also spent time getting associated with what the previous team has done, and what problems they faced. We are going to spend time going over each individuals pages so that we can avoid the mistakes they made, and find ways to push the project forward. going to read over the We will also gauge how far they got, and decide whether or not we should use the same methods they did, or use new ones.

### Next Steps

Our next stepsis to get some information. We are going to review the previous' teams work on the cornstarch project, and we will also look online for cornstarch projects elsewhere. Once we have done some research we're going to see what mistakes the previous team has made, and how we are going to fix and avoid them. We will try and start where the other team left off, so we will figure out if the problem with the cable was due to malfunction of the cable or miss connection of the amplifier, test the oscillator with the oscilloscope, and find a way to connect the oscillator to the speaker board
# Engineering Projects/Corn Starch/Howard Community College/fall2012

* soc
* p2-550-ma
* SOC 2
# Engineering Projects/Corn Starch/Howard Community College

    fall2012
    Fall 2011
# Engineering Projects/Corn Starch/Howard Community College/Fall 2012/SOC 2
### Problem Statement

Analyze the properties of the non-Newtonian fluid corn starch by comparing its reaction to slow and fast speed impacts.

### Team Members

Cyr
Odou
Sesay

### Summary

We got the ramps that would be used for the cornstarch tub so people can walk up on them. We got a new fuse and put it on the circuit board. We also soldered all the wires and got the speaker to make subtle sounds.

### Poster

Put a graphic in wikimedia, include the graphic here or link to it here. The graphic should be suitable for creating a traditional project poster.

### Story

So far we have got the ramps for the cornstarch pool and we were able to sodder wires to the pins on the circuit board. This will essentially connect the whole circuit and get the speaker working.

### Decision List

List all formal decisions made with links to their documentation such as a decision tree or decision matrix.

### Material List

New Fuse
Alligator clips/wires
battery
screws

### Software List

N/A

### Time

80hours 41min

### Tutorials

All projects create new tutorials of technical details future participants are going to want to know. They are going to be separate pages that are linked to here.

### Next Steps

Get an even planned to present cornstarch. Get speaker running again and make cornstarch monster
# English-Chinese/Architecture

Architecture is the art and science of the design of structures or buildings such as houses, places of worship, and office buildings. Architecture is also the profession of an architect. Usually, a person must study at an institution of higher education (university) to become an architect. In ancient times, there were architects long before there was higher education.
建筑 是 建筑物 或 建筑物 设计的 艺术 和 科学，如 房屋，礼拜场所 和 办公楼。建筑 也是 建筑师的 职业。通常，一个人 必须 在 高等教育机构（大学）学习 才能 成为 一名 建筑师。在 远古时代，有 高等教育 之前 很久 就有 建筑师。
# English-Chinese/Arctic Circle

The Arctic Circle is the northernmost of the five main circles of latitude on the map.
北极圈是地图上五个主要纬度圈中最北的。
# English-Chinese/Artery carries blood to body

An artery is a blood vessel that carries blood from the heart to various parts of the body.
动脉是一种把血液从心脏带到身体的各个部位的血管。
# English-Chinese/Architectural engineering

Architectural engineering, also known as building engineering, is the application of engineering principles and technology to building design and construction.
建筑工程 是 工程原理 和 技术 在 建筑设计 和 施工中的 应用。
# English-Chinese/Area

Area is the quantity that expresses the extent of a two-dimensional figure in the plane.
面积 是 表示 平面中 二维图形 范围的 数量。
# English-Chinese/Art movement

An art movement, or artism, is a style in art. It may have a common philosophy, followed by a group of artists. It may be a label given by a critic to describe a type of artwork. It is typical of the post-photography era that art explores new directions.
艺术运动，或 艺术主义，是 艺术中的 一种 风格。它 可能 有 一个 共同的 哲学，有着 一群 艺术家。它 可能 是 评论家 给出的 描述 一种 艺术品的 标签。艺术 探索 新方向 是 典型的 后摄影时代。
# English-Chinese/Arthritis

Arthritis is a kind of diseases that the body joints are damaged. It is the inflammation of the joints. It can cause pain, swelling, and stiffness. It can be very painful to move the joints having arthritis. It is a chronic disease.
关节炎 是 身体关节 受损的 一种 疾病。 它是 关节的 炎症。它 会 引起 疼痛，肿胀 和 僵硬。移动 患有 关节炎的 关节 会 很痛。它是 一种 慢性疾病。