水覆盖了地球表面的大部分。
变化惭进而确定，以至于到最后它影响到地球表面的大部分地区和许多的人们。
The changes came gradually but surely, and in the end they affected a very large portion of the earth's surface and a great many people.
大部分地球表面的一氧化碳都开始存在于岩石中，在太阳的照耀下释放出来。
Much of the carbon dioxide that envelops earth, for example, was originally embedded inside rocks, and later released by heat from the sun.
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