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单词 rock coal
释义

Definition of rock coal in English:

rock coal

noun
US rare

  • A hard form of coal; anthracite.

Origin

Mid 18th century.

Definition of rock coal in US English:

rock coal

noun
US rare

  • A hard form of coal; anthracite.

Origin

Mid 18th century.
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更新时间：2026/3/23 1:42:27