英语词汇“pin timbering”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	pin timbering
释义	pin timbering pin timbering [′pin ‚tim·bə·riŋ] (mining engineering) A method of mine roof support in which bolts are driven up into strong material, thus supporting lower weak layers.
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