英语词汇“pioneer tunnel”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	pioneer tunnel
释义	pioneer tunnel pioneer tunnel [‚pī·ə′nir ‚tən·əl] (mining engineering) A small tunnel parallel to but ahead of a main tunnel and used to make crosscuts to the path that the main tunnel will follow.
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