炮艇

例句：

1. 1.The police boat was speeding through thebusy harbor.
   警用快艇在繁忙的港口疾驰。
2. 2. The sloophad just arrived from a long voyage.
   这艘快艇刚刚完成了一次长途航行。
3. 3. The cutter was used torescue people in distress.
   快艇被用来救援处于困境中的人。