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。
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。
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。
Almost half the serious droughts of the past 60 years have occurred since 1990.
过去60年的严重干旱几乎一半发生在1990年后。
Precisely such a dreaded blowout is presumed to have occurred on the Deepwater Horizon.
事实上，曾有人推测“深海地平线”会发生此类可怕的井喷事故。
Several fatal unprovoked attacks in the United States alone have occurred over the years.
近年来，在美国已经发生了几起人们无缘无故受到鲨鱼攻击的事件。
The last eruption in this volcanic field appears to have occurred about 600 years ago.
该地区上一次火山喷发大约发生在600年前。
This compromise must reflect the dramatic demographic changes that have occurred since 1967.
这一妥协必须反映自1967年以来已经发生的戏剧性人口变化。
Martin was sorry for “any misuse that might have occurred,” he answered in an Aug. 30 e-mail.
马丁在当月30日的回信中说，“误用行为可能偶有发生，对此我表示抱歉。”
Eruptive activity at Nevado del Ruiz may have occurred in 1994, but this is not confirmed.
据称1994年火山也发生一次喷发，但未得到进一步确认。
Since 1973, 13 temblors of magnitude 7.0 or greater have occurred there, according to the USGS.
据美国地质勘探局说，自1973年以来，那里发生了13次7.0级或以上地震。
Most cases have occurred in Uige municipality, which has reported 175 cases and 163 deaths.
大多数病例发生在威热市，该市已报告175例和163例死亡。
In addition, 140 possible occupational transmissions have occurred among healthcare personnel.
此外，在医护人员之间发生了140起职业传染。
Many, though not all, severe cases have occurred in people with underlying chronic conditions.
虽然并非全部，但许多严重病例是原本患有慢性病的人。
The distribution of material around Marsili hints that smaller collapses have occurred there before.
马西里海山四周分布的物质表明，这里以前曾发生过一些小规模的崩塌。
Since the 1979 article was published, many large magnitude earthquakes have occurred as expected.
从1979年那篇文章发表后，正如人们预计的那样，发生了很多高震级地震。
The majority of the reported cases and deaths have occurred in the population aged over 15 years.
所报告的大多数病例和死亡发生在15岁以上的人群中。
However, even bigger quakes have occurred at the plate boundaries along the west coast and Alaska.
然而，更强的地震曾发生于西海岸以及阿拉斯加的板块交界处。
The shortage you claimed might have occurred in the course of transit, which is out of our control.
贵方所提出的货物短缺可能是在运输过程中发生的，这是我们所无法控制的。
The shortage you claimed might have occurred in the course of transit, which is out of our control.
贵方所提出的货物短缺可能是在运输过程中发生的，这是我们所无法控制的。
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