Some of the prints were badly discoloured.有些图片褪色严重。Spilt acid discoloured the floor.泼出的酸弄得地板褪色.Sunlight had discoloured the bright red curtain.日照使这朱红(色的)窗帘褪了色....
Microscopically the ores are medium grained to amorphous.显微镜下,矿石为中粒至非晶质.The only local coarse - grained sand - stones in the uppermost part are important for uranium.仅最上面局部的粗粒砂岩对铀是有利的.Fine - grained clay may settle out i...