求翻译：步进电机通过联轴器把运动传递给丝杠，螺母移动带动连杆角度变化，且两侧连杆对称变化，最终使调焦镜由精密导轨导向，实现调焦。是什么意思？

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stepper motor through the shaft is passed to the movement's mobile-driven insertion point bars, nuts, and two side fusible links change symmetric change lens, which eventually led to reduced by adjusting the focus precision rails-oriented and to achieve.

Step-by-steps the electrical machinery to transmit through the shaft coupling the movement gives the guide screw, the nut moves the impetus connecting rod angle change, also the both sides connecting rod symmetrical change, finally causes the focusing mirror to guide by the precision guide rail, rea

Step motor by coupling campaign passed to the screw, nut mobile drive connecting rod angle changes, connecting rods and both sides symmetric changes so that eventually adjust Jiao Jing by precision guides Guide to achieve focus.

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