relapse
[rɪˈlæps]
vi.
（病）再发，复发;
故态复萌;
再度堕落;
再陷邪道;
n.
[医]再发，旧病复发;
复旧，故态复萌;
退步;
堕落;
例句:
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A wide range of emotionally stressful events may trigger a relapse.
多种令人情绪紧张的事情都可能引起旧病复发.
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You are well now, but mind you don't have a relapse.
你的病虽然好了, 可要防止反复.
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After making some progress, he suffered a relapse.
他的病好了一点, 又复发了.
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Bilar was cheerfully recovering...Then he had a relapse.
来自P. Cutting
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Will we relapse to tribalism and to endless small wars?
来自SA
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It'll go to my head and I might relapse!
来自NEWYORKER