Most copper miners base investment decisions on a long-term planning price of 80-90 cents a pound. However, the price has quadrupled in the past four years to about $2.70 a pound.是什么意思_Most copper miners base investment decisions on a long-term planning price of 80-90 cents a pound. However, the price has quadrupled in the past four years to about $2.70 a pound.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句