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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Both arguments underestimate the consequences of the middle - class rise.

两种观点都低估了中产阶级增长的后果。

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This will get increasingly worse as temperatures rise further towards the middle of the century.

到本世纪中叶的时候，由于温度的持续升高，这种情况会更糟。

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Experts say job losses might slow later this year, but the unemployment rate could rise until the middle of next year.

VOA: special.2009.05.29

Middle east oil is critical to the rise of India and China, and in that sense it's very much part of the economic process.

中东石油,对于中印的崛起非常关键，因此它是东南亚经济发展的,重大保障。

普林斯顿公开课 - 国际座谈会课程节选

But climate change negotiators worry that without quick action, the carbon footprint of countries like India and China will rise dramatically as their fast-growing economies propel millions into the middle class.

VOA: standard.2009.11.27

This has the perverse result that if the country gets richer, the poverty rate can still rise, as long as incomes at the top and in the middle rise faster than those at the bottom.

ECONOMIST: The poor: The mountain man and the surgeon | The

While selling to 106 different countries, the biggest market remained North America, but with Africa in a strongly-growing second place, and sales of expertise to the Middle East on the rise as well.

BBC: Scottish independence: energy's alternating currents

Although there was no single cause for this European Spring, a variety of radical changes in society, from technology to food shortages to the beginnings of the rise of a middle class, seemed to coalesce into widespread revolt and dissatisfaction with ruling governments.

FORBES: The Arab Spring -- Energy And The Road To Democracy?