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单词 θ6560
释义
the world > the earth > minerals > types of mineral > hydrocarbon minerals > [adjective] > coal > bituminous or sub-bituminous (2)
fat1831

Of wood: Resinous (U.S.); also †of amber. Of coal: Bituminous.

sub-bituminous1835

(esp. of coal) partly or moderately bituminous; cf. semi-bituminous adj. at semi-, prefix affix 2c(j).

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