bitumens

一种粘稠、黑色、高粘度的液体或半固体石油,燃烧时发出明亮火焰；天然产物,广泛存在,如死海和里海沿岸；用于水泥和路面修筑；矿质沥青。

A sticky, black, highly viscous liquid or semi-solid form of petroleum, burning with a bright flame. It occurs as an abundant natural product in many places, as on the shores of the Dead and Caspian Seas. It is used in cements, in the construction of pavements, etc.; Mineral pitch.

天然不纯的碳氢化合物混合物

any of various naturally occurring impure mixtures of hydrocarbons

天然碳氢化合物的一种,包括硬质沥青、半固体软沥青和矿物焦油、油状石油乃至轻质挥发性石脑油。

Any one of the natural hydrocarbons, including the hard, solid, brittle varieties called asphalt, the semisolid maltha and mineral tars, the oily petrolea, and even the light, volatile naphthas.