buoy dropping boat

例句：

1. 1. Thebuoy dropping boat was used tomark the edge of the lake.
   用于标记湖泊边缘的浮标船。
2. 2. Thebuoy dropping boat was a popular touristattraction.
   浮标船是一个受欢迎的旅游景点。
3. 3. Thebuoy dropping boat was used torescue people in distress.
   浮标船被用来救援处于困境中的人。