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。
2
Article 13 Offer-Acceptance a contract is concluded by the exchangeof an offer and an acceptance.
第十三条当事人订立合同，采取要约、承诺方式。
3
Where a contract is concluded by the exchangeof electronic messages, the time of arrival of the acceptance shall be governed by Paragraph 2 of Article 16 hereof.