The U. S. Air Force also will operate an F-35 variant, the a model, a conventional takeoff-and-landing fighter.

美国空军也将经营新的F - 35的变种A型，一种传统的起飞和着陆战斗机。

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A technology company called Pegasus Global Holdings this week announced plans to build a 20-square-mile model of a small U. S. city that could host a population of 35,000.

一家名为飞马国际控股(Pegasus Global Holdings)的科技公司这周宣布，他们计划兴建一座20平方英里的小型美国城市模型，可容纳3万5千人口。

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A pure conduction model is used for modelling the performance of "U"shape downhole heat exchangers (DHEs).

建立了一个描述＂U＂型管式地热井下换热器在导热型地温梯度场内热性能的数学模型。

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Even if News Corp does start charging and others follow suit, analysts say doing a U-turn on the free news model will be hard to pull off.

BBC: Is free news a thing of the past?

The Pentagon is said to be in the midst of a strategic review that will reconfigure U.S. forces away from a model designed for conflict in Europe -- where the putative adversary was the Soviet Union -- to one designed for conflict in Asia, where the presumptive adversary is China.

CENTERFORSECURITYPOLICY: A post-release message for Communist China's leaders

The fact that the President visited Turkey on his first overseas trip and that he described and characterized Turkish-U.S. relations as a model partnership has been very important for us politically and in the process that we all look forward to in the future as well.

WHITEHOUSE: President Obama Meets with Turkish Prime Minister Erdogan