名词
中文翻译：发生
同义词：
['event', 'happening', 'occurrence', 'incident']
例句：
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1. The accident occurred at thecrossing of the road.
事故发生在十字路口。
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2. Thescientist observed several occurrences of spider monkeys in the rainforest.
科学家观察到雨林中多次有蜘蛛猴的出现。
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3. The occurrence of a rare disease inthe population has raised concerns.
人群中罕见疾病的出现引起了人们的担忧。