英语词汇“longwall pillar working”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	longwall pillar working
释义	longwall pillar working longwall pillar working [′lȯŋ‚wȯl ¦pil·ər ‚wərk·iŋ] (mining engineering) A technique used to extract coal pillars left behind in long-pillar working.
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