square pitch arrangement

例句：

1. 1. The room is square and has fourwalls.
   这个房间是正方形的，有四面墙。
2. 2. The square is the center ofthe city.
   这个广场是城市的中心。
3. 3. Thesquare was decorated with colorful flowers.
   那个广场上装饰着五颜六色的花。