Is the house a layer of air or a top floor?

Don't use ~ ~ or 9.10.10/floor for high-rise buildings, because it is too low, the toilet is easy to recall that ~~9 to 1 1 floor is a dust layer, and the dust in the air is basically the same. Try to buy a 3.4.5-story building ~ ~ The first floor is not waterproof and moisture-proof, and the top floor is prone to hot water leakage ~ ~ Unless the developer is very strong ~ ~ The best and simplest way to avoid risks is to look at the pre-sale permit of commercial housing. With this certificate, the house is legal ~ ~ ~