名词
中文翻译：偶发性
同义词：
['occurrence', 'occasionality']
例句：
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1.The occurrence of this event is due to a combination of factors.
这次事件发生的原因是多种因素的综合作用。
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2. The researchers found that the occurrence of this disease was significantly reduced in the treated group.
研究人员发现，在治疗组中，这种疾病的发生显著减少。
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3.The occurrence of this phenomenon has been studied extensively in recent years.
近年来，这种现象的发生已经得到了广泛的研究。