American speech soon changed the words copper bolts into brass tacks. 美国方言随后把copperbolts这个词变成了brasstacks。
Since 2013 Rio and Anglo American have both given up on Pebble, a huge copper deposit in Alaska that is controversial for its potential effect on fisheries, for example. 比如,自2013年以来,力拓和英美资源集团(AngloAmerican)均在Pebble铜矿上打了退堂鼓。这座巨大的铜矿位于美国阿拉斯加州,因对当地渔场有潜在影响而备受争议。
Stack leaching-extraction-electrodeposit technology put into production in American in 1968, the copper trade made rapid progress all over the world since then. 堆浸萃取电积工艺于1968年在美国投产后,在世界铜行业获得了飞速发展。