语音讲解：
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　　Run-down

　　筋疲力尽

　　to be in poor physical condition due to overwork, or inadequate rest

　　由于工作过度或休息不足以至于健康不佳

　　Meyers had been feeling quite run-down for weeks before his liver ailment was diagnosed.

　　在未被诊断为肝病之前，迈耶斯先生几周以来就一直有疲惫的感觉。