| 单词 | coal seam |
| 释义 | Definition of coal seam in English:coal seamnoun
OriginMid 18th century; earliest use found in Margaret Calderwood (1715–1774), diarist and traveller. Definition of coal seam in US English:coal seamnoun
OriginMid 18th century; earliest use found in Margaret Calderwood (1715–1774), diarist and traveller. |
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