英语词汇“leapfrog system”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-现代词典

单词	leapfrog system
释义	leapfrog system leapfrog system [′lēp‚fräg ‚sis·təm] (mining engineering) A system used in mining coal on a longwall face; self-advancing supports are used, with alternate supports advancing as each web of coal is removed.
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