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生命线；命脉
A lifeline is something that enables an organization or group to survive or to continue with an activity.
例句
Information about the job market can be a lifeline for those who are out of work...
对于那些失业的人而言，就业信息可谓是他们的生命线。
The orders will throw a lifeline to Britain's shipyards.
这些订单将给英国的造船厂注入一线生机。