Aerodynamic drag-and-paper roll by manual control of the motor-driven roller may have two fixed aliquation wheel and two lateral movement of the aliquation wheel on your mouse.

• 气不静拖纸辊由手不静把持的电机驱不静，辊不卸装有两个变动的呼气滚轮和两个可以侧向移不静的呼气滚轮。