life jacket

名词 life jacket:

1. life preserver consisting of a sleeveless jacket of buoyant or inflatable design
   同义词：life vest, cork jacket

1. Make sure you wear your life jacket, otherwise-if you fall over board-you'll end up feeding the fishes.
   确信你穿好了救生衣，否则——要是你从船上落入水中——你会葬身鱼腹的。