life preserver
柯林斯词典
1. N-COUNT A life preserver is something such as a jacket, belt or ring, which helps you to float when you have fallen into deep water. 救生用具[美国英语]
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life preserver (life preservers)
剑桥词典
- a lifebelt or life jacket
救生圈或救生衣，救生背心（同 lifebelt 或 life jacket） 返回 life preserver