英语词汇“secondary shaft”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	secondary shaft
释义	secondary shaft secondary shaft [′sek·ən‚der·ē ′shaft] (mining engineering) The shaft which extends a mine downward from the bottom of, but not in line with, the primary shaft.
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