Broken window phenomenon: If a house's windows are broken, no one will repair them. After a while, other windows will be inexplicably broken, so if the bad phenomenon in the environment is left unchecked, it will entice people to imitate it, and even worsen it. According to the above definitions, Which of the following are not broken windows:. ['Some graffiti appeared on one wall and was not removed. Soon, the wall was covered with mess and unsightly things.', 'A clean place, people are embarrassed to throw garbage, but once there is garbage on the ground, people will follow it without hesitation, without being ashamed.', 'An infectious disease occurred in a village. Due to the lack of quarantine, people in the entire village were infected very quickly.', 'In a classroom, two students talked secretly, the teacher did not stop, and soon most of the students in the class were chatting.']