| 单词 | coal bed |
| 释义 | Definition of coal bed in English:coal bednoun
OriginMid 17th century; earliest use found in Henry Power (c1626–1668), natural philosopher and physician. Definition of coal bed in US English:coal bednoun
OriginMid 17th century; earliest use found in Henry Power (c1626–1668), natural philosopher and physician. |
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