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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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更新时间:2025/3/20 11:52:22