...a monstrous copper edifice...又大又难看的铜制建筑物As new mines come on stream, Chile's share of world copper output will increase sharply...新矿投产后，智利在世界铜产量中所占的份额将大幅增加。The paper discusses a new method for producing cupric fe...
We tried to grow some copper sulphate crystals with our children.我们想跟孩子们一起制作硫酸铜晶体。El Salvador produces 100,000 tons of refined copper annually.萨尔瓦多每年生产10万吨纯铜。He makes decorative vessels in copper, stainless steel and sil...