lifesaver

基本解釋

The money that flows back from those who left, most often for Russia or Italy, is a lifesaver.
從那些奔赴他鄉(xiāng)（通常奔赴俄羅斯或意大利）的人寄回的錢(qián)都是救命錢(qián)。
If you are in a traffic jam, and are late to an appointment, the ability to text can be a lifesaver.
如果碰到塞車(chē)來(lái)不及赴約，發(fā)個(gè)短信可能會(huì)成為救命稻草。
Opera may have a small market share, but its voice options can be a lifesaver for those with special needs.
Opera 有小部分的市場(chǎng)份額，但是其Voice選項(xiàng)可能對(duì)有特殊需求的人來(lái)說(shuō)是救命稻草

"It's our lifesaver. I mean,it keeps us working." GM is investing $700 million into the vehicle.
So it's a wonderful vehicle and it's going to be a lifesaver,".
"This vehicle here will similarly be a lifesaver in Afghanistan,"

That would be a major convenience for individuals and a lifesaver for large network operators.
FORBES: Total Recall

If you say that something is a lifesaver, you mean that it helps people in a very important way, often in a way that is important to their health.