它们被厚厚的泥沙沉积物所覆盖，并由于化学变化、压力和温度的作用过程，在漫长的时间中变成了我们所知道的石油。
They were covered with huge deposits of mud; and by processes of chemistry, pressure and temperature were changed through long ages into what we know as oil.
由于化学变化、压力和温度等因素，海洋动物和植物上面覆盖着大量沉积的泥沙，经过漫长的岁月，变成了我们所说的石油。
Sea creatures and plants were covered with huge deposits of mud, and by processes of chemistry, pressure and temperature were changed through long ages into what we know as oil.
经过漫长的岁月，由于化学变化、压力和温度等因素，海洋动物和植物上面覆盖着大量沉积的泥沙，变成了我们所说的石油。
Sea creatures and plants were covered with huge deposits of mud, and by processes of chemistry, pressure and temperature were changed through long ages into what we know as oil.
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