投资者之所以会抛售，而且通常是非理性的进行交易，恐慌是最主要的情感推动因素(昨天，道琼斯指数下跌391点便是最好的例子)。

And fear and panic are the main emotions that drive investor selling, almost always irrationally (see yesterday's 391-point drop in the Dow as an example).

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然而，新的交易型开放式指数基金的特殊目的在于将铜从一个已经供不应求的市场里退出，使投资者和工业用户直接参与供应竞争。

Yet the express purpose of the new ETFs is to take copper off a market that is already tight, bringing investors and industrial consumers into direct competition for supplies.

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另外，交易所指数基金能提供每日的价格和流动性，允许投资者迅速退出和改变他们的市场地位而不遭受因卖出来受到的严重损失。

In addition, ETFs can provide daily pricing and liquidity, allowing investors to exit quickly and change their market position without incurring heavy discounts on selling the product.

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