a unit of area equal to one foot by one foot square
例句
用作名词 (n.)
The net area is about eight hundred square feet. 实用面积约八百平方英尺。
On each side of the entrance was sitting room about sixteen feet square, and beyond them were the offices and the stairs. 门口两旁各有一间约十六平方英尺的起居室,再过去是下房和楼梯。