lifebelts是什么意思？

lifebelts

• n. 救生带，救生圈( lifebelt的名词复数 )；

柯林斯高阶英汉双解学习词典释义

• N-COUNT
  救生圈
  A lifebelt is a large ring, usually made of a light substance such as cork, which someone who has fallen into deep water can use to float.