CNN News：无人驾驶车辆利弊衡量

Which of these companies is not considered one of America`s "Big Three" automakers?

这些公司中哪一家不是美国“三大”汽车制造商之一?

Ford, General Motors, Toyota, or Fiat Chrysler?

福特、通用、丰田还是菲亚特克莱斯勒?

Though it`s one of the largest carmakers in the world, Toyota isn`t considered one of America`s "Big Three" because it`s based in Japan.

虽然丰田是世界上最大的汽车制造商之一，但它并不是美国的“三大汽车制造商”之一，因为它的总部设在日本。

AZUZ: One thing they all have in common is their investment in driverless cars, autonomous vehicles. They`re being tested around the world. And though there`s a lot of talk and excitement over cars and trucks that completely drive themselves, most experts say that won`t be a reality for decades.

“三大”汽车制造商都有一个共同点，那就是他们对无人驾驶汽车、自动驾驶汽车进行投资研发。同时正在世界各地接受测试。尽管对于驱动无人驾驶的汽车和卡车有很多的言论和令人兴奋的成果，但大多数专家说，这在未来几十年里都不会成为现实。

There are debates over whether they`ll make transportation cheaper or worsen urban sprawl, whether they`ll reduce air pollution or increase traffic. There are questions about their safety. And one big concern is how they`ll impact the economy.

这些新研发的汽车是否会降低交通运输成本或会恶化城市蔓延，是否会减少空气污染还是增加交通流量，都存在争论。对于安全也存在争议。另一个重要的问题是这些汽车将如何影响经济。