运行中如果左侧的传感器感应的亮度比右侧的强，那么就会通知的你的差分驱动器向左转。

If the sensor on the left see's more light than the one on the right, tell your differential drive to turn left. If they see the same amount of light, tell your robot to drive straight.

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在电影院向左转，然后直行。它在左侧。

Turn left at the cinema, then go straight. It's on the left.

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下条街左转进入左侧车道。

At next street, we turn left into left lane.

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