The exchange operator, parent of the Chicago Board of Trade, raised margins on gold futures for speculators to $5, 500 per contract from $4, 500 a contract.

芝加哥期货交易所（Chicago Board of Trade）的母公司CME集团是COMEX的运营商，此次调整意味着黄金炒家在进行黄金期货交易时，每份期货合约所要提供的维持保证金从之前的4 500美元上调至5 500美元。

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So, into the futures market to avoid price risk has become a consumer of copper supply, production and operator of the inevitable choice.

那么，走进期货市场，规避价格风险已成为铜供给与消费者、生产与经营者的必然选择。

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The Chicago Merc is part of CME Group, the biggest futures-exchange operator in the U.S., handling an average of 12.5 million contracts a day.

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