“half-header”的概念、定义、翻译、参考文献-科学参考

单词	half-header
释义	half-header [`haf ¦hed·ǝr] ^{MINING ENGINEERING} A large cap piece; used by sawing a header in two and placing, generally, two timbers under the half header on one side of the haulage, with the end extending over the haulage.
随便看	extrapolation extrapolation distance extrapolation ionization chamber extrapyramidal system extrasensory perception extrasystole extraterrestrial intelligence extraterrestrial noise extraterrestrial radiation extratropical cyclone extratropical low extratropical storm extrauterine pregnancy extravasation extravehicular activity extremals extreme extreme and mean ratio extreme close-up extreme line casing extreme line tubing extremely high frequency extremely low frequency extreme narrowing approximation extreme point

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