square drill collar

例句：

1. 1.The room is square and has four walls.
   房间是正方形的，有四堵墙。
2. 2. The square has a large playground forchildren to play on.
   这个广场有一个大操场供孩子们玩耍。
3. 3. The square was decoratedwith colorful flowers during the festival.
   节日期间，这个广场被五颜六色的花朵装饰得非常漂亮。