Where are tens of thousands of college students taking a shit together? If you go to the sewer, where will it exist? Won't it block the sewer? If this is a sewage pool, where is it?
First, thousands of people will not lay eggs. Someone didn't pit either. Second, the sewer flows, with little siltation and occasional blockage, which is the grand scene of "fragrant Wan Li". Third, it is usually discharged to the main urban sewage road through sewage pipes after a little treatment, and flows into rivers and seas.