浮标装置

例句：

1. 1. The buoy was used to guide ships in the harbor.
   这个浮标用来引导港口里的船只。
2. 2. The buoy was a symbol of safety on the river.
   这个浮标是河流上安全的象征。
3. 3. The buoy was raised to warn other boats of the danger ahead.
   这个浮标被升起来警告其他船只前方的危险。