“hard-coal plough”的概念、定义、翻译、参考文献-科学参考

单词	hard-coal plough
释义	hard-coal plough [`härd ¦kōl ´plau̇] ^{MINING ENGINEERING} A plough-type cutter-loader consisting of rigid or swiveling kerfing bits which precut the coal in hard-coal seams.
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