You will be given a definition of a task first, then some input of the task.
You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.

NOUN:

1.The act or process of sucking.
2.A force that causes a fluid or solid to be drawn into an interior space or to adhere to a surface because of the difference between the external and internal pressures.

TRANSITIVE VERB:

1. To draw away or remove by the force of suction: suction fluid from the lungs.
2. To clean or evacuate (a body cavity, for example) by the force of suction.

ADJECTIVE:

1. Creating suction.
2. Operating or operated by suction.
Output:
what's the meaning of suction?