In {HEAD ~ order} to reduce {TAIL ~ the precession vibration} and torsional vibration of the flexible coupling rotating at a high speed, it is important to minimize the backlash at the meshing portion of the gears 
to reduce
In { HEAD ~ order } to reduce { TAIL ~ the precession vibration } and torsional vibration of the flexible coupling rotating at a high speed , it is important to minimize the backlash at the meshing portion of the gears
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