到2004年，原铜产量增长了4倍。2004年原铜产量增长了4。
By 2004 the production of primary copper has increased fivefold.
本文以中国铁矿石、粗铜和原铝生产为研究对象，对其物质投入进行了计算分析。
In this study, material inputs of iron ore, crude copper and crude aluminum of China were calculated and analyzed.
全国铁矿石和粗铜的物质投入在整体上有较明显的下降趋势，但原铝的这一指标则无规律可循。
While the overall material input of iron ore and crude copper displayed a decreasing trend, that of crude aluminum presented ruleless over the study period.
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