英语词汇“spiral ramp system”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	spiral ramp system
释义	spiral ramp system spiral ramp system [′spī·rəl ′ramp ‚sis·təm] (mining engineering) Development of a mine by driving moderately inclined haulageways from the surface to underground ore horizons.
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