The contacthole (19) has an elliptical planar shape.
接触孔（19） 的平面形状为椭圆形。
2
Electrode contacthole USES heavily doped for reducing contact conduction loss.
电极接触孔处采用重掺杂，减小接触电导损失。
3
Furthermore, the contact finite element was adopted to gain the accurate distribution of strength in the subassembly with the interference between the axle hole and the shaft.