地球会变成什么(样子), 直到45亿至38亿年前这个云团变成一个固体的球状物, 才确定下来。
2) The earth became so violent that it was not clear whether the shape would last or not.
地球变得激烈动荡, 不知道这个固体形状是否会继续存在下去。
3) What is even more important is that as the earth cooled down, water began to appear on its surface.
更重要的是, 随着地球的冷却, 地球的表面就开始出现了水。
4) It was not immediately obvious that water was to be fundamental to the development of life.
水对于生命的发展会起关键作用, 这一点在当时并不明显。
5) What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.
很多科学家相信, 由于地球上长期有水存在, 使地球得以把有害气体和酸性物质溶解在海洋里。
6) Why they suddenly disappeared still remains a mystery.
为什么他们突然消失了, 至今还是个谜。
7) So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.
所以, 在未来的数百万年中, 生命能否在地球上延续取决于这个问题能否得到解决。
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