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。
The split between humans and living apes is thought by some scholars to have occurred 15 to 20 million years ago.
一些学者认为人类和猿的分化出现在一千五百万到两千万年前。
Today green algae live mainly in freshwater, suggesting that their early evolutionary history may have occurred in freshwater habitats.
如今的绿藻大多生活在淡水水域中，这一点说明它们的早期进化史可能起源于淡水生境。
The same effects of inbreeding may have occurred in controlled cattle populations, with some additional, and perhaps unrecognized, advantages.
近亲繁殖在有限的一部分牛群中可能会有同样的效果，同时它还有其他一些也许还未被认识到的优点。
During this relatively short period of time, greater changes in people's living conditions have occurred than in the thousands of years which preceded.
在这相对短暂的时间里，人们的生活条件发生了比之前几千年更大的变化。
This phenomenon was not necessarily confined to the Pleistocene, but may have occurred much earlier in the Southeastern Asian islands, although evidence is fragmentary.
尽管证据很少，但这种现象并不一定局限于更新世，而可能在东南亚诸岛发生得更早。
In recent years rapid Manhattanization and Vancouverism have occurred in Las Vegas.
近年来，拉斯维加斯出现了快速的曼哈顿化和温哥华化。
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。
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。
These high-risk exposures should not have occurred.
这些高危接触是不应该发生的。
The predicted market dip certainly seems to have occurred.
无疑，预计中的股市下跌似乎已经发生。
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。
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。
The broader context in which these events have occurred is well known.
这些事件发生的广阔背景众所周知。
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。
If it is constant over time, a probable deadlock or hang could have occurred.
如果它长时间不变，那么很可能是发生了死锁或挂起。
If any of these glitches have occurred, you need to fix them before continuing.
如果发生了以上任何一种小故障，您都必须修复错误，然后才能基础。
If any of these glitches have occurred, you need to fix them before continuing.
如果发生了以上任何一种小故障，您都必须修复错误，然后才能基础。
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