mood swing

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释义
情绪波动
(psychology) A rapid and extreme changing in mood, from
excessively happy to desperately miserable.

例句
Eleanor: What's wrong?
Blair：I don't know. I can't be held responsible for her mood swings.（Gossip Girl）
埃莉诺：色瑞纳怎么啦？
布莱尔：我不知道。她心情不好，不关我的事。（绯闻女孩）