The strategy can take numerous shapes, matching stocks with options, two classes of the same stock, commodities against each other or just about any two assets that are affected by the same forces.

这一策略可以多种形式实施：股票配期权、同一股票的两个类别互配、各种大宗商品进行组合搭配，或用受同一力量影响的任意两项资产进行配对交易。

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The association's only complaint was about the deadline — which forces larger stores to take down their displays by April of 2012 and gives smaller stores an extra three years to comply with the ban.

医疗协会唯一不满的是条令的限期，条令规定大商店在2012年四月前撤下陈列，而小商店则还有更多三年的限期。

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A 2004 paper by Robert Gilmer, an economist with the Dallas Fed, has an interesting take on some of the forces that have helped Texas diversify.

罗伯特·基尔默(Robert Gilmer)是达拉斯联邦储备局的一名经济学家，他在2004年的一篇报告中对于促使德州经济多样化的原因提出了一个有趣的观点。

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Admiral Mullen welcomed the statement by Afghan President Hamid Karzai this week that he wants his forces to be able to take responsibility for security in the country by 2014.

VOA: standard.2010.07.22

and coalition forces to the Afghans. Announcing an increase of 30,000 U.S. troops last week, U.S.President Barack Obama said they will begin to hand over security responsibility to Afghan forces by July of 2011, but he did not say how long the transition will take.

VOA: standard.2009.12.09

But the information the Russians reportedly provided was incorrect, and it may actually have helped U.S. forces take the Iraqis by surprise.

NPR: Report: Saddam Doubted War Would Come

Activists had hoped that this year's session would agree to expand the definition to take account of violence perpetrated by government forces or security personnel, which could dramatically expand its remit.

MSN: Global diamond scheme completes Zimbabwe's rehabilitation - Business - Stocks & economy | NBC News

The U.S. military has tried to take action to prevent attacks by Afghan forces, appointing monitors to provide security for troops working with Afghans, boosting its counterintelligence infrastructure in Afghanistan, adopting an eight-step vetting process for Afghan recruits and revising the training they receive.

CNN: STORY HIGHLIGHTS