a unit of area equal to one foot by one foot square
square foot的用法和樣例：
例句
用作名詞 (n.)
The net area is about eight hundred square feet. 實用面積約八百平方英尺。
On each side of the entrance was sitting room about sixteen feet square, and beyond them were the offices and the stairs. 門口兩旁各有一間約十六平方英尺的起居室，再過去是下房和樓梯。
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