lifesaver
n. 济急的人；水难救生员；救命者
复数 lifesavers
例句
The new drug is a potential lifesaver.
这种新药有可能成为一种救命药。
《牛津词典》
The cervical smear test is a lifesaver.
宫颈涂片检查是健康救星。
《柯林斯英汉双解大词典》
David wanted to be a lifesaver but he couldn't swim!
戴维想当救生员，可他不会游泳！
