Bring to class a memo or business letter that you have received since coming to the U. s.

带一份你来美国后收到的一封商业信件或便笺到课堂上。

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Just be aware that the best rates are usually found for international travel, as well as U.S. domestic business and first class flights.

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The airline launched nonstop U.S. flights offering both business-class and a premium-type coach cabin.

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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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