cur＝to run（流；跑） 变化型 course
1 [C] event; incident; happening 事件; 事情; 发生的事
*Robbery is now an everyday occurrence. 抢劫的事现在每天都有.
* an unfortunate occurrence 不幸事件.
2 [U] (fml 文) fact, frequency, etc of sth happening 事情发生的事实或频繁
*He's studying the occurrence of accidents on this piece of road, ie how often, etc they take place. 他在研究这段路上发生事故的情形.
3 (idm 习语) be of frequent, rare, common, etc oc`currence (fml 文) happen or take place frequently, rarely, etc 经常、很少...发生
*Riots are of frequent occurrence in this province. 这省经常发生骚乱.
NOTE ON USAGE 用法
*Compare event, occurrenceand incident. 试比较event、occurrence、incident三词. Occurrence is the most neutral and does not indicate a particular type of happening *occurrence为中性词, 并不特指某类型的事
*Divorce has become an everyday occurrence. 离婚已成为每天都有的事了. An event is often a happening of importance *event常指重大事件
*Their wedding will be quite an event, ie a large number of people will attend. 他们的婚礼将是件大事（即将有许多人参加）.
* The events of
1968 changed Western society. 1968年的事件改变了西方社会. An incident is usually of less importance, often occurring in a narrative *incident通常指不太重要的事情, 经常出现于叙述中
*You don't have to write down every little incident in your life. 你不必把生活中每一件事都记录下来. It can also refer to a conflict or disagreement, often involving violence 这个词还可指冲突或不和, 常涉及暴力行动
*The kidnapping caused an international incident. 这一绑架事件引起了国际纠纷.
something that happens
→occurrencefrequent/rare/common occurrence Laughter was a rare occurrence in his classroom. Flooding in the area is a common occurrence. [singular]
the fact of something happeningoccurrence of The frequent occurrence of earthquakes in the area means that the buildings must be specifically designed to withstand the force.
1. This is a rare occurrence as our climate seldom goes to extremes. 但是在我们这里，气候很少发生异常，河水极少泛滥。
2. However, even if prediction becomes possible, people who live in areas where earthquakes are a common occurrence will still have to do their best to prevent disasters by building structures that are resistant to ground movement and by being personall 然而，即使可以预测，居住在地震频发区的人们还是应尽力预防灾难，办法是建造能够抵抗地表运动的房屋，同时做好个人准备。
3. Robbery is now an everyday occurrence. 抢劫的事现在每天都有.