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How many floors should I buy for the small high-rise 1 1 floor?

First floor: In some cases, the location of the first floor is very good. When accidents happen, such as earthquake, fire, collapse and other major accidents, the first floor is a good place to escape. 8 to 1 1 layer: the advantage of this layer is brightness. Tall trees can't reach this height, and the light is unobstructed, so they are naturally extremely bright. & gt