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。
Similar incidents have occurred before.
类似的事件以前也发生过。
That seems to have occurred first in Central America.
这似乎首先发生在中美洲。
In the much more distant past, other ice ages have occurred.
在更久远的过去，其他冰河时代也曾发生过这种情况。
The mass extinction would have occurred very suddenly under this hypothesis.
在这种假设下，大灭绝的发生是非常突然的。
Cases have occurred all year round.
病例全年发生。
Similar rows have occurred before.
类似的划清界线以前也发生过。
Most problems have occurred lower down.
大部分的问题发生在下层。
In this case in U. S. history have occurred.
这种情况在美国历史上也曾发生过。
So far, no such incidents have occurred, he said.
到目前为止，还没有这样的事件发生，他说。
This could have occurred nowhere but in England.
这种事只可能在英国发生。
Life could not have occurred without water and air.
如果没有空气和水，就不可能有生命的起源。
Building damage may have occurred where you least expect it.
你认为最不可能有危险的地方，可能实际上建筑物已经有破坏了。
This was also when the apple incident is said to have occurred.
据说著名的“苹果事件”也是在这段时期发生的。
Without those focused meetings none of that would have occurred.
要是没有这些专注的会议，所有这些都不会发生。
If I had kept my shirt on, the blister would not have occurred.
如果我一直保持我的衬衣上，水泡就不会发生。
This incident is only one of many that have occurred in my life.
这个故事只是发生在我的生活中的许多类似事件中的一个。
All these seem to have occurred naturally for centuries, and still do.
这些现象似乎自然地发生已经很多世纪了，而且仍然在继续。
To date, the majority of human cases have occurred in rural areas.
迄今为止，多数人间病例发生在农村。
Our deployment would not have occurred without a truly joint effort.
如果没有真正的共同努力，我们的部署行动就不会发生。
An event is a record of what changes have occurred in the event directory.
事件是对事件目录中已发生更改的记录。
They have occurred in areas not associated to the New Madrid fault line.
这些震动也与新马德里断层线无关。
The second most recent supernova is believed to have occurred around 1680.
第二个最新产生的超新星据说在1680年左右就存在了。
But he offered no explanation of how the rare incident might have occurred.
但他没有对这一罕见事故如何发生做出解释。
Luckly, no major damage seems to have occurred to the House of the Moralist.
幸运的是，道士殿似乎没有大的损坏。
So far, six deaths have occurred at the high school level this August alone.
目前，仅八月份，高中就已发生6例死亡案例。
The fault is entirely mine and I deeply regret that it should have occurred.
这完全都是我的错，我对所发生的一切深表遗憾。
The fault is entirely mine and I deeply regret that it should have occurred.
这完全都是我的错，我对所发生的一切深表遗憾。
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