Sensor for the front car of the phototube.

传感器为车前排的光电管。

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In the front you can see a sensor of the wheel-counting device.

在前方，还可以看到一个计轴传感器。

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To flush toilet, put your hand in front of the sensor.

使用完后请将手放在感应器前放水冲洗。

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To flush toilet, put your hand in front of the sensor.

使用完后请将手放在感应器前放水冲洗。

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