circle communication network

例句：

1. 1.The sun is shining in a perfect circle above the tree.
   太阳在树顶上完美地圆周发光。
2. 2. The teacher drew a circle on the blackboard.
   老师在黑板上画了一个圆。
3. 3. The children are playing in a big circle.
   孩子们正在一个大圈里玩耍。