中国是这种天然沥青的主要进口国之一。

China is one of the major importers of the natural pitch.

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路面铺的是天然沥青。

The surface is asphalt.

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这种沥青大都经过天然蒸发、氧化，一般已不含有任何毒素。

The asphalt mostly through the natural evaporation and oxidation, generally do not contain any poison.

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并用此知识于石油、天然气及有关的沥青勘探和开采。

And the use of this knowledge in exploration and recovery of oil. gas, and related bitumens.

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并用此知识于石油、天然气及有关的沥青勘探和开采。

And the use of this knowledge in exploration and recovery of oil. gas, and related bitumens.

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