N-UNCOUNT Bitumen is a black sticky substance which is obtained from tar or oil and is used in making roads. 沥青; 柏油
Any of various natural bitumens, such as mineral pitch or asphalt.
树脂，自然沥青：某种自然的沥青，如矿石沥青或树脂。
Any of various natural bitumens, such as mineral pitch or asphalt.
树脂，自然沥青某种自然的沥青，如矿石沥青或树脂。
And the use of this knowledge in exploration and recovery of oil. gas, and related bitumens.
并用此知识于石油、天然气及有关的沥青勘探和开采。
词组短语
应用推荐