| 词汇 | paper coal |
| 释义 | Definition of paper coal in English:paper coalnoun
OriginMid 19th century; earliest use found in Charles Lyell (1797–1875), geologist. Definition of paper coal in US English:paper coalnoun
OriginMid 19th century; earliest use found in Charles Lyell (1797–1875), geologist. |
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