The gear train is operably coupled to the clutch and configured to receive the predetermined amount of torque from the motor.

齿轮系可操作地联接到离合器上，并且构造成从电动机接收预定量的转矩。

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The clutch is operably coupled to the motor and configured to prevent the motor from transferring more than a predetermined amount of torque.

离合器可操作地联接到电动机上，并且构造成防止电动机传递大于预定量的转矩。

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