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。
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