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1·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。

2·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。

3·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。

4·It is known that noise pollution from offshore industry, shipping and sonar can impair underwater communication, but can it really drive whales onto our beaches?

众所周知，来自近海工业、船舶和声纳的噪音污染会阻碍水下通信，但这些噪音真的能把鲸鱼赶到我们的海滩上吗？

5·It is known that the Little Ice Age cooling began in Greenland and the Arctic in about 1200.

据了解，小冰河期的降温始于约1200年的格陵兰岛和北极。

6·It is known that the distribution of groundwater is uneven, and that much of it lies at great depths.

大家知道，地下水的分布是不均匀的，而且它们大部分都埋在很深的地方。

7·It is known that bimetallic and trimetallic catalysts offer improved properties over single metal catalysts.

已知双金属和三金属催化剂提供了优于单金属催化剂的性能。

8·It is known that he is an expert.

人们认为他是一位专家。

9·It is known that strong body is a foundation of beatific life.

它是已知的，强壮的身体是一种幸福的生活的基础。

10·It is known that strong body is a foundation of beatific life.

据了解，强壮的身体是一种幸福的生活基础。