“prop-free”的概念、定义、翻译、参考文献-科学参考

单词	prop-free
释义	prop-free [`präp ´frē] ^{MINING ENGINEERING} A face with no posts between the coal and the conveyor used to remove it in longwall mining of a coal seam.
随便看	area sampling area search area survey area target area triangulation area vitellina area wall areaway Arecaceae Arecales Arecidae arecoline areg A register arena arenaceous arenarious Arenaviridae arendalite arene Arenicolidae arenicolite arenicolous Arenigian arenite

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