lifeblood
/ˈlaɪfblʌd/ 36The lifeblood of an organization, area, or person is the most important thing that they need in order to exist, develop, or be successful. 生命线
noun [具体名词]生机的根源；生命必须的血液；命脉；命根子
Tourism is the lifeblood of the city.
旅游业是这座城市的命脉。
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