It will build a smelter to refine copper ore, and a railroad to carry coal to the power plant and copper back to China.

它还将建设一座冶炼厂来提炼铜矿石，同时建设一条铁路，一方面向发电站运输煤矿，另一方面把这些铜运回中国。

youdao

If you were to go back and look, you could see that this is copper.

如果你回头看，你会发现这是铜。

youdao

His hair has reverted back to its original copper hue.

他的头发恢复到了原来的铜色。

《柯林斯英汉双解大词典》

So, hopefully, if you were to go back and look you could see that this is, in fact, copper.

因此，我希望大家如果回去再看一遍,这个题目的话，能够知道这是铜原子。

麻省理工公开课 - 化学原理课程节选

Still, copper prices were back under pressure despite a short-lived bounce off 18-month lows Thursday.

WSJ: European Stocks Gain, Yen Slides

In copper, speculators switched back to net-short positions for the first time since Nov. 27.

FORBES: FOCUS: Speculators' Net-Long Position In Gold Rebounds Temporarily - CFTC

Copper bulls and bears are back on a level near-term technical playing field.

FORBES: Comex Gold Ends Higher amid Bullish "Outside Markets"