生命带

例句：

1. 1. He was wearing a life belt while swimming in the ocean.
   他在海里游泳时穿着救生带。
2. 2.The life belt is designed to keep you safe in case of an emergency.
   救生带是为了在紧急情况下保持你安全而设计的。
3. 3. During the storm, she used her life belt to stay afloat.
   暴风雨中，她用救生带保持浮力。