ALLEN: Maybe you're right. They will have to develop alternative transportation.

艾伦：也许你说得对，它们必须开发其他的交通工具。

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Hover boards will be sold commercially — still high-end devices, but useful for urban transportation as an alternative to bicycles.

滑板将用于商用——它仍将是高端的设备，不过它可以作为自行车的替代品，用于城市运输。

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A key theme this year is clean transportation, including cars and buses driven by fuel cells, natural gas and other alternative sources.

今年的主题是清洁交通，这包括由燃料电池、天然气和其他替代能源驱动的轿车和公共汽车。

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Train travel in the U.S. as a serious intercity transportation alternative is a thing of the past.

CENTERFORSECURITYPOLICY: Not a model railroad

SideCar is one of the various startups providing ride-sharing through mobile apps, seeking to bring a new type of transportation alternative to cities.

FORBES: SideCar Raises $10 Million From Google Ventures, Lightspeed

City officials and alternative transportation advocates have said bicycle use has surged in recent years, as have the number of tourists who annually visit New York City.

WSJ: Bridge Traffic On Walkway Stirs Concern