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单词
mineral charcoal
释义
WordReference Random House Unabridged Dictionary of American English © 2024
min
′
eral char
′
coal,
Mineralogy, Mining
a fibrous substance resembling charcoal and having a high carbon content, often occurring in thin layers in bituminous coal. Also called
mother of coal.
1795–1805
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pitch in
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pitch pipe
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更新时间:2026/4/21 21:01:35