depression [dɪˈpreʃn]

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n.压抑，抑制，沮丧；萧条，衰退

the state of feeling very unhappy and without hope for the future

During a depression money circulates slowly. 在商业萧条时期，货币流通滞缓。
He suffers from acute depression. 他患有严重的忧郁症。