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-现代词典

单词	pioneer tunnel
释义	pioneer tunnel noun or pioneer bore : a small tunnel parallel to a main tunnel and well in advance of the completed main tunnel so that by crosscuts to the line of the main tunnel several headings can be exposed and work expedited
随便看	ice floe ice flower ice fog ice foot ice fork ice fox ice-free ice front ice gland ice green ice gull ice hockey icehouse ice in ice island ice-laid ice lance iceland iceland iceland crystal iceland cur iceland dog icelander iceland gull icelandic

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