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单词 vitrain
释义
vit·rain (vĭtrān)
n.
A brilliant black band in bituminous coal, characterized by cubic cleavage, a conchoidal fracture, and a vitreous luster.

[Latin vitreus, made of glass, glassy; see VITREOUS + (FUS)AIN.]
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更新时间:2024/9/20 12:20:59