However, scientists previously thought, HIV from the body chimpanzee SIV.
不过，科学家先前认为，HIV源于黑猩猩身上的SIV。
Our planet's risk of being hit by a dangerous outer space rock may be smaller than scientists previously thought.
我们这颗星球被太空小行星(陨石)击中的危险可能比科学家以前估计的更小一些。
Previously it was thought there were around 100, 000 microbial cells in every litre of seawater but scientists now think there could be one billion.
在此前的推测中，每一升海水中可能会有大约10万个微生物细胞，但现在科学家们认为有可能达到10亿个。
Scientists believe this "return trip effect" is not caused by being more familiar with the route on a return journey, as previously thought, but because of different expectations.
以前我们认为产生这种“回程效应”的原因是我们对回程的路线更加熟悉，而科学家们却认为是因为期望的不同。
Previously it was thought there was around 100, 000 microbial cells in every litre of seawater but scientists now think there could be one billion.
在此前的推测中，每一升海水中可能会有大约100,000个微生物细胞，但现在科学家设想这一数字有可能达到十亿。
The world's largest colony of leatherback sea turtles has been identified by scientists, raising hopes that the giant creature may not be as endangered as previously thought.
科学家最近发现了世界上数量最多的棱皮龟群体，这无疑唤起了一些信心，或许这种巨型动物并不像以前所认为的那样濒临灭绝。
Scientists lobbed a bombshell into the world of sub-atomic theory on Wednesday by reporting that a primary building block of the visible Universe, the proton, is smaller than previously thought.
科学家们周三向亚原子理论的世界抛了颗重磅炸弹：可见世界的一块基石——质子——比先前人们认为得要小。
Previously, scientists thought only small mammals and newborn babies harbored brown fat.
之前，科学家们认为只有小的哺乳动物和新生儿拥有灰色脂肪。
It now has scientists thinking the extinct flying reptile had a wingspan of up to seven metres, two or three metres bigger than previously thought.
现如今，科学家们认为，这种已经灭绝的、可飞行的爬行类动物的翼展可达到7米长，比先前的设想要长2米或者3米。
However, scientists have created a new model for predicting the impact of such collisions that shows the devastation wouldn't be anywhere near as severe as previously thought.
然而，科学家们已经建构出了新的模型来预测这种撞击的影响，结果显示这种破坏并不是如人们之前所预想的那么严重，不是在你附近的任何地方都会发生。
This predatory species was found at 23, 678 feet (7, 217 meters), where scientists had previously thought it was impossible to support such life.
这种掠食动物发现于23678英尺(7217米)的深度。在此之前，科学家们认为这样的深度中栉水母无法生存。
Scientists had previously thought the circadian clock was driven by gene activity, but both the algae and the red blood cells kept time without it.
科学家们曾认为昼夜节律的调节是受基因活动支配，但海藻和红细胞中都不含DNA。
But the death toll, scientists now say, wasn't as high as previously thought.
然而，科学家现在声称，其实死亡人数并不像之前所想的那样多。
Last week, a group of ocean scientists released a report concluding that the sea is in much worse shape than previously thought.
上周，一群海洋科学家发布了一份报告，该报告声称海洋比他们此前想象的还要糟糕。
Antarctic scientists have combined measurements provided by an underwater robot with existing satellite data to show that Antarctic sea ice may be thicker than previously thought.
南极的科学家通过一个水下机器人与现有的卫星提供的数据相结合的测量表明，南极海冰可以更厚比以前认为的。
In April scientists reported that ozone damage is far worse than previously thought.
科学家们在4月份报告说，臭氧层破坏之严重远远超出过去的估计。
The New York City area is at "substantially greater" risk of earthquakes than previously thought, scientists said Thursday.
周四，地震研究者表明：纽约市的地震风险等级正在大大增加。
The New York City area is at "substantially greater" risk of earthquakes than previously thought, scientists said Thursday.
周四，地震研究者表明：纽约市的地震风险等级正在大大增加。
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