人类使用石屑超过二百万年，但在那段时间里，人类的生活几乎没有改变。
Human beings used stone chips for more than two million years, but human life changed very little in that time.
这些沉积物位于地表，主要是由泥土、砂砾和一种粘稠的石油构成，这些石油板结成块，看起来就像土块和石屑。
Deposits sit on top of the earth, and they're composed of clay, sand and a dense form of petroleum that clumps like sod and crumbles.
这意味着尘土和石屑像雨点似地飘落在雕刻者的身上。
This means dust and stone raining down onto the sculptor. The shallowness of the marble now poses the greatest challenge.
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