On the design of urinal.

Dude, the direct cause of this problem is cigarette butts.

The principle of bending is to prevent the smell from coming up from the sewer, because there will be a certain amount of water, and the smell will be sealed by water, just like a toilet.

At present, many urinals have ashtrays above them or plastic nets below them. To put it bluntly, it is still a quality problem, that is, cigarette butts, things that don't run, and people who smoke are not clean. I always thought so.