chance upon [tʃɑ:ns əˈpɔn]

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附加级

偶然碰见；偶然发现

Perhaps you might chance upon the dictionary at some old bookstall.或许你会在旧书摊上偶然发现这本字典。
If you chance upon that document,let me know.如果你碰巧发现了那文件，请通知我。