Few big ideas have excited tech investors over the past few years as much as self-driving vehicles, and billions of dollars have been spent developing driverless cars, trucks and delivery vans.
过去几年里，几乎没什么重大创意能像自动驾驶汽车这样让科技投资者如此兴奋，他们已经投入巨额资金用于开发无人驾驶汽车、卡车和送货车。
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