动词短语
中文翻译：偶然发现
同义词：
['happen upon', 'chance upon', 'stumble upon例句：1. I came in upon her unexpectedly at the party.（我在聚会上偶然遇见了她。）']
例句：
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1. I came in upon her unexpectedly at the party.
我在聚会上偶然遇见了她。
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2.They chanced upon a hidden treasure in the forest.
他们在森林里偶然发现了一个隐藏的宝藏。
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3. The old man stumbled upon the answer to his problem while walking down the street.
老人在散步时偶然找到了他问题的答案。