n.救生索；生命线
He threw me a lifeline when he offered me a job. 他给我工作就相当于拋给了我一条救命索。
He clung to the lifeline and the woman pulled him towards the bank. 他紧紧抓住救生索，那个女人把他拉向岸边。
Public transport is a lifeline for many rural communities. 公共交通对许多农村居民来说是不可或缺的。
