单词 | pack wall |
释义 | Definition of pack wall in English:pack wallnoun Coal Mining
OriginMid 19th century; earliest use found in Warington Smyth (1817–1890), mining engineer and geologist. Definition of pack wall in US English:pack wallnoun Coal Mining
OriginMid 19th century; earliest use found in Warington Smyth (1817–1890), mining engineer and geologist. |
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