an incident or event
发生的事;事件
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vandalism used to be a rare occurrence .故意破坏公共财产的行为过去极少发生。
[mass noun]the fact or frequency of something happening
发生;发生频率
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the occurrence of cancer increases with age .发生癌症的频率随着年龄而增加。
[mass noun]the fact of something existing or being found in a place or under a particular set of conditions
存在;出现
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the occurrence of natural gas fields .天然气田的出现。
"mid 16th cent.: probably from the plural of archaic