Lifesaver
01
救生圈, 救生浮具
a life preserver in the form of a ring of buoyant material
02
救生员, 救生员
an attendant employed at a beach or pool to protect swimmers from accidents
03
救星, 救命稻草
something that provides great help in a difficult situation
Informal
例子
This portable charger is a lifesaver when my phone dies.
这个便携充电器在我的手机没电时是一个救星。
That coffee was a total lifesaver during the night shift.
那杯咖啡在夜班期间完全是个救星。
