Many scientists knew him.

许多科学家都知道他。

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Scientists knew that extremely large mammals evolved within a few million years after the end of the dinosaurs.

科学家知道体型庞大的哺乳类们在恐龙灭绝后的几百万年就进化了出来。

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Previously, scientists knew of only one gene, called APOE4, which increases the risk of developing the most common form of the disease.

在此之前，科学家只知道一种称为载脂蛋白e4 (APOE4)的基因会增加患最普遍老年痴呆症的风险。

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This much scientists knew. However,they were not clear on how that receptor was activated when this kind of painful event occurred.

VOA: standard.2010.05.04

Hungarian-born scientist Leo Szilard, Fermi and other scientists knew they needed to leapfrog the bureaucracy.

FORBES: A Veterans Day Story: Immigrants and the Atomic Bomb

In the 1950s, Russian and American scientists knew there was no limit to the power of thermonuclear hydrogen bombs.

FORBES: It Was On A Night Like This In Russia, 50 Years Ago...

By observing the cloud of dust and gas kicked up by each impact, scientists knew they could obtain valuable data about the Moon's composition.

BBC: Nasa reveals new information about moon probes crash sites