| n 用法:
1 (nautical 海) (a) line or rope for saving life such as that attached to a lifebelt, or fastened along the deck of a ship in a storm for sailors to hold on to 救生索.
(b) line attached to a deep-sea diver （深海潜水员的）信号绳. 用法:
2 (fig 比喻) anything on which sb/sth depends for continued existence 生命线; 命脉:
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. |