英语词汇“pilot 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	pilot tunnel
释义	pilot tunnel pilot tunnel [′pī·lət ‚tən·əl] (engineering) A small tunnel or shaft excavated in advance of the main drivage in mining and tunnel building to gain information about the ground, create a free face, and thus simplify the blasting operations.
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