英语词汇“mine signal system”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-现代词典

单词	mine signal system
释义	mine signal system mine signal system [′mīn ′sig·nəl ‚sis·təm] (mining engineering) Signal lights installed at individual track switches immediately indicating to the motorman whether or not it is safe to proceed.
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