n.救命者；水难救生员；救生工具
The new drug is a potential lifesaver. 这种新药有可能成为一种救命药。
He thought of the old man as his lifesaver. 他把老人看作他的救命恩人。
In the case of the Jacobses, that could be a lifesaver. 对于雅各布斯一家人来说,这可能成为救命索。
