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Maybe it's the sixth floor itself that stinks, why the eighth floor? Why not the seventh floor?
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Who didn't flush it, or the water pipe leaked.
The waterproof layer of the bathroom on the seventh floor is broken, and the seventh floor is responsible for repairing it.
The bathroom is always smelly, that's because the sewer in your bathroom doesn't have a water seal, buy an anti-odor floor drain to try.
These toilet pipes are infrastructure, if there is damage, then it is the collective responsibility, if there is no one on the ninth floor, only you have to find someone to repair it.
Find a property, complain.
It is extremely rare to see snakes in the city, wild ones, as high as the probability of winning the lottery and the third prize of the two-color ball. Unless it's a pet. Excessive anxiety.