life blood
柯林斯詞典
1. N-SING The lifeblood of an organization, area, or person is the most important thing that they need in order to exist, develop, or be successful. 生命線[usu with poss]
Small businesses are the lifeblood of the economy. 小型企業(yè)是經(jīng)濟(jì)的生力軍。
Coal and steel were the region's lifeblood. 煤炭和鋼鐵曾是這個(gè)地區(qū)的生命線。
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