动词
中文翻译：偶然发现
同义词：
['happen upon', 'chance upon', 'stumble upon']
例句：
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1.I came upon a beautiful painting in the museum yesterday.
我昨天在博物馆偶然发现了一幅美丽的画作。
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2. She came upon a surprise birthday gift from her friend.
她从朋友那里偶然收到了一个惊喜的生日礼物。
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3.The old house came upon us unexpectedly when we were moving into the new apartment.
当我们搬进新公寓时，这座老房子突然出现了。