建材建筑行业专业英语第53页 ... 影院整个还音系统 complete sound reproduction system 硬（灰）石 rag stone 硬地面 hardstand ...
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粗砂岩 farewell rock; greet stone; grit stone; gritrock; gritstone; grouan; growan; rag stone; sand grit; sandstone grit 长石质 feldspathic .
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rag stone province 硬质岩区
N a hard sandstone or limestone, esp when used for building (尤指用于建筑的)硬质岩石 (Also called rag, ragg)
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