At the end of the video, the camera spirals around the building overhead as the broad logo appears on the screen: a lowercase b that wraps around itself in an imitation of the @ symbol.
3
这些汽车的加减速由软件控制，而沿路的交通信号灯及其它标志则由摄像机读取并识别。
The software controls acceleration and deceleration, while the cameras read and interpret traffic lights and other signs.
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