围攻军

例句：

1. 1. The city was encircled by a ring of hills.
   这座城市被一圈山环抱。
2. 2. The sun sets in the west, encircling the earth with its golden rays.
   太阳在西边落下，用它的金色光芒环绕地球。
3. 3.The moon is said to encircle the Earth at night.
   据说月亮在晚上环绕地球。