Kevin's first class of the day is U. S. History.

凯文今天的第一节课是美国历史。

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The clients located in Europe, the U. S. , Japan and other countries, mainly for the world 500 strong enterprises, we strive to provide the first-class service.

公司客户分布在欧、美、日等国家，主要为世界500强企业，我们竭尽全力为其提供一流的服务。

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U. S. buyers will first see the S-class as the S550, with a twin-turbo, 4.6-liter, 449-hp V8 under the hood and a seven-speed automatic, in either rear-drive or all-wheel-drive configurations.

美国消费者最早看到的S级轿车会是S550，它配备了最大输出功率为335千瓦的4.6升双涡轮V8发动机，后轮驱动与全时四轮驱动款均配备七速自动变速器。

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The deal made DST one of the largest first-class mailers in the U.S. 1.8 billion items in 2000 but the new business has its own problems.

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Leff, who has only ever flown first-class, has loyalty card status on all U.S. airline programs and currently has three million miles across all his accounts.

CNN: The fabulous lives of air miles millionaires

The number of passengers in the U.S. paying for first-class, business-class and full-price economy airfares has halved in the past five years, from 18% to 9%, says the Velocity Group, an aviation consultancy.

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