The president wants to spend $105 billion over the next five years to improve the nation's motorways and mass transit systems.

总统要在今后五年花费1千零50亿美元来改善该国的公路和公共交通系统。

《柯林斯英汉双解大词典》

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。

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While better fuel-efficiency is good news for Americans' wallets and less driving good for the country's air, for its highways and mass-transit systems, it is something of a disaster.

虽然，更高的燃油效率能节省美国人的经济支出，少驾车也有利于改善美国的空气质量，但这对美国的高速公路和公共交通系统却可以说是一种灾难。

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In the wake of the bombings, cities in the United States and Europe boosted security in and around their mass transit systems.

VOA: standard.2010.03.30

Eighty billion dollars of that total was to be pumped into the U.S.economy to promote development of renewable energy, urban mass transit, high-speed rail systems and clean energy jobs.

VOA: standard.2010.02.25

Urban planners advise that cities with populations of more than 2 million should have mass transit systems.

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Over the next 20, it could build as many as 170 new mass transit systems.

WHITEHOUSE: President Obama on Infrastructure Investment

This led New York authorities to step up security on the city's mass transit systems.

CNN: From Long Island to Lahore: The plot to bomb New York