life saver 救生员
N the saver of a person's life 救命者
Or having no tap. Or having nowhere to go where you can find any of this life-saver.
你可以想一想，假如打开龙头没有水流出来，或者根本没有龙头，也没有地方能找到救命的水，你将会怎样。
This is a life-saver for me every time I have to explain to people that I do not eat meat.
当我每次需要向他人解释我不吃肉时，这句话是我的救命稻草。
Having a team of people on the standby can be a life-saver when disaster strikes close to deadline.
当灾难逼近最后期限时，有一群人在你身边就可能会成为你的救命稻草。
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