occur
- vi.发生;出现;出现在;存在于
过去式： occurred 现在分词： occurring 过去分词： occurred 第三人称单数： occurs
oc- 表强调 + cur- 跑,流动
occurverb
发生；出现
to happen
When exactly did the incident occur?
这一事件究竟是什么时候发生的？
Something unexpected occurred.
发生了一件出乎意料的事。
存在于；出现在
to exist or be found somewhere
Sugar occurs naturally in fruit.
水果天然含糖分。
被想到；出现在头脑中
to come into your mind
The idea occurred to him in a dream.
这个主意是他在梦中想到的。
It didn't occur to him that his wife was having an affair.
他没有想到自己的妻子有婚外情。
It didn't occur to her to ask for help.
她没想到请别人帮忙。
occur
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1
VERB 发生
When something occurs, it happens.If headaches only occur at night, lack of fresh air and oxygen is often the cause...
如果只是在晚上头疼，那常常是由于缺乏新鲜空气和氧气的缘故。
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2
VERB 存在；出现；有
When something occurs in a particular place, it exists or is present there.The cattle disease occurs more or less anywhere in Africa where the fly occurs...
在非洲凡是有这种蝇虫的地方，几乎都会出现这一牛病。
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3
VERB （想法或主意）被想到，被想起，浮现于脑海中
If a thought or idea occurs to you, you suddenly think of it or realize it.It did not occur to me to check my insurance policy...
我没有想到要核实我的保险单条款。
verb
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1
- come to pass
- What is happening?
- The meeting took place off without an incidence
- Nothing occurred that seemed important
- Synonym: happen hap go on pass off pass fall out come about take place
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2
- come to one's mind;suggest itself
- It occurred to me that we should hire another secretary
- A great idea then came to her
- Synonym: come
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3
- to be found to exist
- sexism occurs in many workplaces
- precious stones occur in a large area in Brazil
数据来源：WordNet
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When exactly did the incident occur ?
这一事件究竟是什么时候发生的？
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Such events occur only when the external conditions are favorable .
这种事情只有在外部条件有利时才会发生。
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These changes have occurred over a long time span .
这些变化经过了很长一段时间才形成。
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We need to know the exact time the incident occurred .
我们需要了解事情发生的确切时间。
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The idea occurred to him in a dream .
这个主意是他在梦中想到的。
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One of the funniest episodes in the book occurs in Chapter 6 .
书中最有趣的片段之一在第6章。
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The prosecution stated that intercourse had occurred on several occasions .
控诉方称发生过数次性交。
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The department denies responsibility for what occurred .
这个部门拒绝为所发生的事承担责任。
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The robbery occurred in broad daylight , in a crowded street .
抢劫就发生在光天化日之下的一条熙熙攘攘的街道上。
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Sugar occurs naturally in fruit .
水果天然含糖分。
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Rattlesnakes occur in the warmer , drier parts of North America .
响尾蛇出现在北美温暖干燥的地区。
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Something unexpected occurred .
发生了一件出乎意料的事。
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The murder occurred just a block from the precinct .
谋杀案就发生在和警察分局相隔一条街的地方。
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There will come a time when the crisis will occur .
危机总有一天会爆发。
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It did not occur to me to check my insurance policy
我没有想到要核实我的保险单条款。
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No one has suggested how this might occur
没人说得清这事是怎么发生的。
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It occurred to me that I could have the book sent to me
我想到可以让人把书寄给我。
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It never occurs to them to question the doctor 's decisions
他们从未想过要怀疑医生的决定。
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After 19 May , strikes were occurring on a daily basis
5月19日之后，每天都会发生罢工。
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Emergency cooling systems could fail and a reactor meltdown could occur .
紧急冷却系统有可能失灵，核反应堆有可能发生堆芯熔毁。
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About two in every five epileptic fits occur during sleep
每5例癫痫病中约有两例是在睡眠过程中发作的。
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It occurs in elderly men , apparently as part of the ageing process
这种情况出现在老年人当中，显然是衰老过程的一部分。
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Another unexpected event , though of quite a different order , occurred one evening in 1973
1973年的一个夜晚，又发生了一件始料未及的事情，不过这两件事完全不同。
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Changes in temperature occur slowly and are constrained within relatively tight bounds .
温度变化缓慢，而且局限在相对较小的范围内。
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At least one supernova occurs per decade in our galaxy .
在我们的星系中每10年至少有一颗超新星出现。
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Most of the damage that 's occurred was simply because of fallen trees
目前大部分损坏都是因为倒下的树木造成的。
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The time frame within which all this occurred was from September 1985 to March 1986
这一切发生的时间范围是1985年9月到1986年3月。
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The crash occurred when the crew shut down the wrong engine
机务人员关错了引擎，随即飞机坠毁。
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I have known dramatic changes occur in the space of a few minutes with this method .
我知道用这种方法短短几分钟之内就能够产生急剧的变化。
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The human brain needs to be without oxygen for only four minutes before permanent damage occurs .
人的大脑缺氧4分钟后便会造成永久性损伤。
普通用词，多用于偶然事件。
The accident happened at 5 o'clock.
事故发生在5点钟。
What happened then?
后来又发生了什么事？
可用于偶然事件或计划之事，可与 happen 换用。
The earthquake occurred/happened at dawn.
地震发生在黎明时分。
A serious traffic accident occurred/happened yesterday.
昨天发生了一起严重的交通事故。
主要用于事先计划好的事情。
Great changes have taken place in China.
中国发生了翻天覆地的变化。
The parade will take place on Sunday, rain or shine.
庆祝游行定于星期日举行，风雨无阻。
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