圆圈

例句：

1. 1. The teacher drew a circle on the board.
   老师在黑板上画了一个圆圈。
2. 2. The children were playing in the park with their friends.
   孩子们和他们的朋友在公园里玩耍。
3. 3. The moon is a perfect circle in the sky.
   月亮是天空中完美的圆圈。