英语词汇“protobitumen”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	protobitumen
释义	protobitumen protobitumen [¦prōd·ō·bə′tü·mən] (materials) Any of the fats, oils, waxes, or resins which are present as unaltered or nearly unaltered plant and animal products from which fossil bitumens are formed.
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