encircling ring

例句：

1. 1.The moon is encircling the Earth tonight.
   今晚月亮在环绕地球。
2. 2.The city was surrounded by a sea of trees.
   这座城市被一片树林包围。
3. 3. The ball was encircled by a group of children.
   球被一群孩子包围着。