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　　happen (尤指不愉快的事) 发生；碰巧

　　happen to do sth:

　　Later that day, I happened to pass Jeff in the dining room.

　　那天晚些时候，我在餐厅碰巧从杰夫身边走过。

　　happen to sb / sth:

　　A few days ago, something very bad happened to my friend Lily.

　　几天前，我的朋友莉莉遇上了件倒霉事。

　　it (so) happens that / as it happens:

　　It so happened that I had no money on me. / As it happened, I had no money on me.

　　碰巧我身上没带钱。

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