square spring steel

例句：

1. 1. The tableis square and has four legs.
   桌子是正方形的，有四条腿。
2. 2. The roomis square and has a large window.
   房间是正方形的，有一个大窗户。
3. 3. Thesquare is the center of the city.
   这个广场是城市的中心。