A thick black tar intermediate between petroleum and asphalt.
一种稠而黑的焦油中间体，介于石油和沥青之间。
Asphaltum is a brownish-black solid or semisolid mixture of bitumens obtained from native deposits or as a petroleum byproduct, used in paving, roofing, and waterproofing.
沥青，是一种黑褐色固体或半固体沥青混合物，采自天然矿藏或是石油的副产品，用于铺路，封屋顶和防水。
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