You must turn off the switch when anything goes wrong with the motor.
如果电动机有什么毛病时，你必须关掉开关。
We use that switch to control this motor.
我们用那个开关管制马达。
The electric motor is controlled by a pedal switch to rotate or stop.
所述的电动机由脚踏开关控制转动或停止。
The battery is connected with the motor by an electric rope through a switch.
电瓶和电机由电绳通过开关连接。
The battery is connected with the motor by an electric rope through a switch.
电瓶和电机由电绳通过开关连接。
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