exhaustion [ɪgˈzɔ:stʃən]

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n.耗尽枯竭，疲惫，筋疲力尽，竭尽，详尽无遗的论述

when you are extremely tired

She slept the sleep of exhaustion. 她因疲劳而酣睡。
His exhaustion was obvious when he fell asleep standing. 他站着睡着了，显然是太累了。