IBM has strived to make itself more broadly relevant by focusing on clean air and water, more efficient health care, and mass transportation.
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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。
For others, a combination of mass transit and private transportation may be desirable.
对另一些人来说,公共交通和私人交通相结合是可取的。
Better design and wiser use of both mass transit systems and private vehicles will play an important part in helping America get more out of energy used for transportation.
对公共交通系统和私人汽车进行更好的设计及更合理的使用,会在帮助美国交通获得更多可用能量上发挥重要作用。
Cities in the United States and Europe have increased security in and around their mass transportation systems.
VOA: special.2010.04.03
"We must keep in mind how even apparently unsuccessful attacks on Western mass transportation systems can bring major cities to a halt, cost the enemy billions and send his corporations into bankruptcy."
VOA: standard.2010.04.01
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