burst with joy;be beside oneself with joy;be highly delighted;be so pleased that one's heart sang ;

His mood oscillates between euphoria and depression.
他的心情在幸福感与沮丧的两极端间游移((一下心花怒放,一下又变得愁眉苦脸)).
来源:词典精选例句Both of them burst out laughing, and Harry enraptured and was at his ease.
两人禁不住都笑了.这一笑, 使哈里心花怒放,轻松多了.
来源:词典精选例句
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