“pioneer tunnel”的概念、定义、翻译、参考文献-科学参考

单词	pioneer tunnel
释义	pioneer tunnel [´pī·ǝ`nir ´tǝn·ǝl] ^{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.
随便看	sternum height sternway stern wheel Stern-Zartman experiment steroid sterol sterone sterrettite sterrometal Stetefeldt furnace stethoscope stewartite Sthenurinae sthène stibiconite stibide stibiocolumbite stibium stibnate stibnite stibophen Stichaeidae Stichocotylidae Stichopodidae stichtite

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