life-saver

剑桥词典

life-saver noun [C] (HELP)


someone or something that gives you a lot of help when you are in a very difficult situation
救命之人；救星；救命之物
When you're stuck in traffic , a mobile phone's an absolute life-saver. 当你遇到交通堵塞的时候，手机真成了救星。

life-saver noun [C] (WATER)

Australian English
a person on a beach or at a swimming pool whose job is to make certain that the swimmers are safe and save them if they are in danger
救生员
比较
lifeguard 返回 life-saver