Mainly introduced the oil sand nature as well as the present oil sand distribution and the reserves, elaborated the oil sand method of exploitation and the oil sand separation method.

主要介绍了油砂的性质以及目前油砂的分布及储量，阐述了油砂的开采方法及油砂的分离方法。

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The new insight, published in the December issue of the journal Antiquity, came because two archaeologists decided to use a decidedly low-tech method to understand the sand drawing's ancient secrets: by walking it.

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It extracts oil from the ground using a method called fracking - pumping down a mixture of sand, water and chemicals at high pressure.

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