“pilot tunnel”的概念、定义、翻译、参考文献-科学参考

单词	pilot tunnel
释义	pilot tunnel [`pī·lǝt ´tǝn·ǝl] ^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.
随便看	solid-state computer solid-state counter solid-state device solid-state image sensor solid-state lamp solid-state laser solid-state maser solid-state memory solid-state physics solid-state relay solid-state switch solid-state thyratron solid-state uninterruptible power system solid-state welding solid stowing solid tantalum capacitor solidus solidus curve solid-web girder solifluction solifluction lobe solifluction mantle solifluction sheet solifluction stream solifluction tongue

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