形容词
中文翻译：Unknown
同义词：
['accidental', 'coincidental', 'incidental', 'serendipitous']
例句：
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1. The coinciding of the two events was a stroke of luck.
两个事件的巧合是一次幸运。
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2. He found the book on the table, coincidentally.
他偶然发现那本书在桌子上。
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3. The coincidence of their meeting was serendipitous.
他们的相遇是偶然的。