I am not sure how clouds get formed. But the clouds know how to do it, and that is the important thing.
我不大清楚云是怎么形成的，可是云自己知道，这一点才是最重要的。
I 'not sure how clouds are formed but clouds know how todo it and that's the important thing.
我不知道云怎么形成的，但是云自己知道自己该怎么做，这才是最重要的。
It has been shown that stars, including our own solar system, are formed by contraction of cold and dark interstellar clouds.
研究表明，包括太阳在内的恒星是由冷暗的星际分子云收缩形成的。
It has been shown that stars, including our own solar system, are formed by contraction of cold and dark interstellar clouds.
研究表明，包括太阳在内的恒星是由冷暗的星际分子云收缩形成的。
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