Historians suggest that the advent of mass tourism began in England during the industrial revolution with the rise of the middle class and the availability of relatively inexpensive transportation.

历史学家认为，大众旅游的出现始于工业革命时期的英国，当时中产阶级崛起，交通费用也变得相对便宜。

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Rising world food prices are the result of a number of factors including higher transportation costs, drought, and increased demand from a growing middle class in China and India.

世界粮食价格上涨是多种因素造成的，包括运输成本的提高、干旱，以及中国和印度日益增长的中产阶层需求的增加。

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Committed to first-class products used in intelligent transportation, finance, customs, border and other areas.

致力于将一流的产品应用在智能交通、金融、海关、边防等领域中。

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However, if she did make an appearance, the luxury jeweler will pay round-trip, first-class air transportation (including to and from Europe) and first-class hotel accommodations for Peretti and another person.

FORBES: The Tiffany-Peretti Deal Could Be Worth $436 Million

Building a world-class transportation system is part of what made us a economic superpower.

WHITEHOUSE: Address by the President to a Joint Session of Congress

Building a world-class transportation system is part of what made us an economic superpower.

FORBES: Full Text: President Obama's Address To Congress On His Jobs Plan