sheet diked swarm

例句：

1. 1. Thesheet was torn in the wind.
   床单在风中被撕破了。
2. 2. She was surrounded by a crowd of people.
   她周围聚集了一大群人。
3. 3. The thief was caught in a mob of onlookers.
   这个小偷被围观的人群抓住。