The current source includes a metal source, a buffer layer, a filter and a collector.

电流源包括金属源、 缓冲器层、过滤器和收集器。

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Moreover, as one of major ore-forming elements, copper isotope composition can directly trace ore-metal source and ore-forming process.

并且，由于铜是主要成矿元素之一，所以铜同位素对于成矿物质来源和成矿过程的示踪更为直接。

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The third main source of supply is scrap: jewellery sold to dealers for the value of the metal.

第三大供给来源自黄金回收：首饰商按金属价值卖给金贩子。

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Overall, industrial use will remain perhaps the dominant source of demand for the metal, Newman said.

FORBES: Thomson Reuters GFMS' Newman: Silver May Move Toward $50 Yet In 2011

According to our source, Apple will make one major change to the rear casing, adding a metal panel to the central back of the new iPhone.

FORBES: Confirmed? New iPhone Will Be Longer and Thinner and Have Smaller Dock Connector