Any of various thick,dark,sticky substances obtained from the distillation residue of coal tar,wood tar,or petroleum and used for waterproofing,roofing,caulking,and paving.
英
美
释义
沥青,人造沥青某种厚厚的、黑而粘的物质,由炭焦、木焦或石油的剩余物中提炼出来,用于防水、盖屋顶、填缝和铺路。
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