So magical, the deeper you go, the more it is drained and exploited.

I also looked at the Weibo of image two. I think that going out to sweep the floor is usually done early in the morning when there are fewer people, and most people clean before going to work. Is there someone specifically at the computer receiving possible unexpected distress signals? Maybe no one is looking at all.

It's just to keep a record of which sanitation worker didn't work hard, right?