Install turn signal lamp bulb.

安装转向信号灯灯泡。

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The signal lamp designated that it is dangerous.

信号灯显示有危险。

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What lean is that the automatic command system of traffic signal lamp.

靠的是交通信号灯的自动指挥系统。

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What lean is that the automatic command system of traffic signal lamp.

靠的是交通信号灯的自动指挥系统。

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