“pillar-and-room system”的概念、定义、翻译、参考文献-科学参考

单词	pillar-and-room system
释义	pillar-and-room system [`pil·ǝr ǝn `rüm ´sis·tǝm] ^{MINING ENGINEERING} A system of mining whereby solid blocks of coal are left on either side of working places to support the roof until first-mining has been completed, when the pillar coal is then recovered.
随便看	chemoheterotroph chemonite chemoorganotroph chemoprevention chemoprophylaxis chemoreception chemoreceptor chemosmosis chemosphere chemostat chemosurgery chemosynthesis chemotaxin chemotaxis chemotaxonomy chemotherapeutic chemotherapeutic index chemotherapy chemotropism Chemungian chemurgy chenevixite chenic acid chenier chenille

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