square rule

例句：

1. 1.The square is the center of the city.
   这个广场是城市的中心。
2. 2. He bought a new square table for his office.
   他为办公室买了一张新的方桌。
3. 3. The square was filled with people watching the parade.
   广场上挤满了观看游行的人群。