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单词 凝灰岩
例句 DEFINITIVE EXAMPLES 权威例句〔calc-tufa〕Calcareous tufa, a porous or spongy deposit of calcium carbonate found in calcareous mineral springs.多孔状凝灰岩:石灰质的凝灰岩,碳酸钙多孔或有吸收性的沉淀物,出现在石灰性矿物泉中美国传统〔ignimbrite〕A volcanic rock formed by the welding together of tuff material from an explosive volcanic eruption.熔结凝灰岩:火山喷发后凝灰物质聚集后形成的一种火成岩美国传统〔trass〕A light-colored tuff used in hydraulic cement.粗面凝灰岩:一种用来生产硬水泥的淡色凝灰岩美国传统
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