The gold, detached from the copper, forms a sediment at the bottom of the cell.

针脚里的铜溶解之后与金分离，金沉淀在电解池底部。

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Strong heavy devices called bolts held the ship's bottom together. These bolts were made of copper.

坚固的螺钉把船底连接到一起，这种螺钉用铜制成。

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What do you think will happen if we take the copper-bottom pot out of the tub and use a single penny instead?

如果我们将铜底锅从盆中取出而使用一个硬币代替，您认为会发生什么情况？

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We face a tough six to eight months, but towards the end of the year we should touch bottom on copper, aluminum and zinc.

CNN: Money & Investing

After World War II Lowe's became known hundreds of miles around for rock-bottom prices on nails, copper pipe and lumber by the railcar-load.

FORBES: Merchant Princes

Both byproduct metals have risen in price since the second quarter of 2009 (copper has gained 25% and zinc 19%.) Stronger copper and zinc prices will reduce cash cost per ounce and go directly toward the bottom line for companies with significant byproduct credits, like Barrick Gold, Newmont Mining, Goldcorp, Agnico-Eagle and Yamana Gold.

FORBES: Magazine Article