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]
The life preserver kept him up until the boat came.
救生衣使他保持浮在水面直到小船来救他。
Alright, I'll go and take my life preserver. Promise me nothing bad will happen.
那好吧，我去拿救生圈。你要保证我没事。
Floating seat cushion: if someone fell overboard, could function as a life preserver.
飘浮的座位靠垫：如果有人从船上翻落水中时，可作救生用。
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