life·blood
noun/ˈlaɪfblʌd/
/ˈlaɪfblʌd/
[uncountable]- lifeblood (of something) the thing that keeps something strong and healthy and is necessary for successful development
（事物的）命脉；生命线；命根子 - Tourism is the lifeblood of the city.
旅游业是这座城市的命脉。
- Tourism is the lifeblood of the city.
- (literary) a person’s blood, when it is thought of as the thing that is necessary for life
（人的）命脉；生命必需的血液 - The wound was draining the lifeblood from him.
伤口正在耗尽他的生命力。
- The wound was draining the lifeblood from him.