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The cement floor is not smoothed before laying the floor, and the floor will definitely break down after a long time. It is very troublesome to repair, after lifting all the floors, first smooth the floor with cement, and then re-lay the floor after the cement is dry.
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Don't bother, just break that piece up. It's good to re-do it.
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The floor is too tight. Don't blame the floor. Don't be if you don't understand.
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The horizon was not well found.
It could be that a neighbor who shares the same sewer line as you is repairing the sewer line. It is possible that someone else's house is blocked and is being repaired.
The upward side is the ventilation pipe, and the downward side is the sewage pipe, which prevents water from flowing to the ventilation pipe, and also plays a role in ventilation.
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Get a maintenance person to come to your door, or try the one with the toilet.
Is it not enough to buy a small one? If it's not enough, you can place a shelving or bedside table. If you can't buy the finished product, you can order one on Taobao. It is fashionable and practical.