- 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 - (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. 伤口正在从他身上抽出生命线。