The city is an exact square, each side of the wall being five hundred feet long.

这座城市是一个正方形， 每边的墙长五百英尺。

This travelling-closet was an exact square, with a window in the middle of three of the squares, and each window was latticed with iron wire on the outside, to prevent accidents in long journeys.

这个旅行箱是一个正方形，在三个正方形的中间有一扇窗户，每扇窗户外面都用铁丝网成格子，以防长途旅行发生意外。