本期内容：

Electric carmaker Tesla says a vehicle involved in a fatal crash in California was in Autopilot mode, raising further questions about the safety of self-driving technology. One of the company's Model X cars crashed into a roadside barrier and caught fire on 23 March. Tesla's Autopilot system does some of the things a fully autonomous machine can do. It can brake, accelerate and steer by itself under certain conditions, but it is classified as a driver assistance system and as such the driver is meant to have their hands on the wheel at all times.

vehicle:交通工具，汽车
fatal：致命的
crash：车祸
autonomous：自动的
brake：刹车
accelerate：加速
steer：行驶
be meant to: 应该……

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