Both of these scenarios imply that specialization to each niche occurred only once.
这两套不同的理论都意味着，适应不同的栖息地生活环境的这一过程只发生了一次。
Twenge and her colleagues wanted to understand why this change in average wellbeing occurred.
特温格和她的同事们想要了解为什么平均幸福感会发生这样的变化。
The pictures are timed at 9:05 am last Saturday, just half an hour before the robbery occurred.
这些照片是在上周六上午9点05分拍的，就在抢劫发生半小时前。
In the last decade, a revolution has occurred in the way that scientists think about the brain.
过去十年，科学家对于大脑的思考方式发生了巨大的改变。
Shrub expansion has occurred in other environments, like semiarid grassland, and tall grass prairies.
灌木的扩张也发生在其他环境中，比如半干旱草原和高草草原。
However, similar changes occurred when the subjects were asked simply to open their mouths or to breathe deeply.
然而，受试者仅仅被要求张嘴或深呼吸时，也有类似的变化发生。
Glaciation, Young claims, has occurred throughout Earth's history, and there is evidence that it occurred toward the end off the Permian period.
杨说，冰川作用在地球的整个发展历史中都有发生，有证据表明它发生在二叠纪末期。
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。
First, the observation may be unreliable in that two or more observers may not agree that the particular response occurred, or to what degree it occurred.
首先，观察结果可能会不可靠，因为两个及以上的观察者可能无法对特定的具体反应是否发生以及反应发生的程度达成一致意见。
When 23-year-old Marilyn Brown started to feel run-down last December, it never occurred to her that she could have tuberculosis.
当23岁的玛丽莲•布朗去年12月开始感到疲惫的时候，她未曾想到她会得肺结核。
The blast occurred when volatile chemicals exploded.
冲击波是在易挥发的化学品爆炸时产生的。
Presently it occurred to Tom that maybe Huck might come this very night and give the signal.
汤姆忽然想到，也许哈克今晚就会来发出信号。
Presently it occurred to him that he wished he was sick; then he could stay home from school.
过了一会儿，他突然有了想法，他希望自己生病了；然后他就可以呆在家里不去上学了。
We're big advocates of bodily autonomy and not forcing him to hug or kiss people unless he wants to, but it never occurred to me that I should ask his permission to post photos of him online.
我们极力主张身体自主，除非他自愿，不会强迫他拥抱或亲吻别人，但我从未想过，应该征得他的同意后才在网络上发布他的照片。
The increase in brightness of the x-ray sources over the same period has occurred far faster.
在同一时期内，X 射线光源亮度的增加速度要快得多。
It occurred to him that fireworks might provide an effective way of demonstrating how stars were formed.
他突然想到，烟火也许可以有效地展现恒星是如何形成的。
The second occurred as the university party passed the heavily-fortified US embassy in Amman in a minibus.
第二次事发于大学代表团乘坐一辆小型客车经过戒备森严的美国驻安曼大使馆时。
Since Heidi had come home again to her grandfather, she did many things that had never occurred to her before.
自从海蒂回到爷爷家后，她做了许多以前从未想过的事情。
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。
In Earth's earliest atmosphere, methane and carbon dioxide occurred at much higher levels than at present-a circumstance that was favorable for early life.
在地球最早的大气层中，甲烷和二氧化碳的含量比现在要高得多，这对早期生命来说是有利的。
If a service crashes, the events that occurred at the very end provide the most clues.
如果某个服务崩溃了，那么最后发生的事件将提供最有价值的线索。
It occurred to me that few of my Chinese friends have ever heard true country music.
在我看来，我的中国朋友中几乎没有谁听到过真正的美国乡村音乐。
The thought of picking up the phone, let alone buying a card, had not occurred to her.
她从未想过打个电话，更别提买张贺卡了。
He had lived his whole life that way, and it never occurred to him to act any other way.
他一生都以这样的方式活着，从没想过要换任何其他方式。
There then occurred one of those chance minor events that sometimes decide the fate of nations.
之后就发生了一件能够影响国家命运的小概率事件。
However, the latest bout of risk aversion has occurred against the backdrop of low volumes.
不过，最新这一轮避险行动，是在交投清淡的背景下发生的。
However, the latest bout of risk aversion has occurred against the backdrop of low volumes.
不过，最新这一轮避险行动，是在交投清淡的背景下发生的。
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