Already it is known that bones, muscles and nerves develop faster in baby girls.

众所周知，女婴的骨骼、肌肉和神经发育得更快。

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It is known that pollution is a long-term problem, and no single government can meet the challenge alone.

众所周知，污染是一个长期问题，没有任何一个政府能够单独应对这个挑战。

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It is known that when there are many of these flowers together, their strong smell will make anyone breathing it fall asleep, even sleep forever.

众所周知，当这些花大量聚集在一起，任何闻到它们强烈气味的人都会入睡，甚至是永远入睡。

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He landed in California. He left a hole so deep that to this day it is known as Death Valley.

VOA: special.2009.11.28

I wanted to talk about another instance of regulation that is important in the united States but it's very poorly known.

我想谈谈另一种监管措施,在美国十分重要,但鲜为人知

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This was known for a long time, but it took Mr. Einstein to figure out why nature is behaving in that fashion.

这一点在很早以前就人所共知了,不过是爱因斯坦先生解释了,大自然为什么以这种模式运行

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It is known that stiffening of the arteries can lead to heart disease and stroke.

BBC: Heart symptoms in obese children

But it is known that he is 66 and was once a heavy smoker and drinker.

ECONOMIST: The state the North Korean regime is in

It is known that this operation had links to private security firms and to official intelligence services.

ECONOMIST: The curious case of a clear-out of spymasters in Rome