名詞 life jacket:

1. life preserver consisting of a sleeveless jacket of buoyant or inflatable design
   同義詞：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.
   確信你穿好了救生衣，否則——要是你從船上落入水中——你會(huì)葬身魚腹的。