n.救命者；水難救生員；救生工具
The new drug is a potential lifesaver. 這種新藥有可能成為一種救命藥。
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. 對于雅各布斯一家人來說,這可能成為救命索。
