sea buoy

例句：

1. 1. The sailors used thesea buoy to guide their boatback to shore.
   水手们使用救生圈来引导他们的船回到岸边。
2. 2. Thechildren played on the beach with the seabuoy as a toy.
   孩子们在沙滩上用救生圈当玩具玩耍。
3. 3. The lifebuoy was acrucial part of the rescue operation.
   救生圈是救援行动中至关重要的一部分。