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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》

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.

FORBES: Delhi's Subway Builder

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