救生衣

例句：

1. 1. The life jacket isa crucial piece of equipment for diving indeep water.
   救生衣是潜水时在深水中至关重要的设备。
2. 2. Hewore a life vest whileswimming in the ocean.
   他在海里游泳时穿着救生衣。
3. 3. Thelife jacket was designed to keep people safein case of an emergency.
   救生衣被设计成在紧急情况下保护人们安全。