The broad Dow Jones-UBS Commodity Index was off 3.4%.

道琼斯瑞银商品指数宽幅下跌了3.4%。

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The Dow Jones-UBS Commodity Index has seesawed since it plunged from its June 2008 peak, and is trending downward at the moment.

WSJ: The End of the Commodities Boom?

The Dow Jones-UBS Commodity Index is down 2.62% for the first half of the year, said John Prestbo, editor and executive director of the Dow Jones Indexes.

FORBES: 'QE3' Would Be The 'Most Bullish Factor' For Commodities -- Panel

One of the best ways to trade copper prices besides futures contracts is the iPath Dow Jones-UBS Copper Sub-Index Total Return ETN ( JJC).

FORBES: A Panic Low in Copper, FCX?