英语词汇“pack wall”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	pack wall
释义	pack wall pack wall [′pak ‚wȯl] (mining engineering) A wall of dry stone built along the side of a roadway, or in the waste area, of a coal or metal mine to help support the roof and to retain the packing material and prevent its spreading into the roadway.
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