选择孔 meaning in Chinese

select holes

However , if the plane of the selector aperture is not precisely coplanar with that of the first image , then diffracted rays originating from outside the area defined by the aperture may contribute to the diffraction pattern
然而，如果选择孔的平面与第一次成像不是正好共面，源自孔指定区域外部的衍射线可能影响衍射模型。
This is achieved experimentally by focusing the selector aperture on the final screen using the diffraction lens , which is most accurately done after removing the objective aperture , and then ( after replacing the objective aperture ) focusing the specimen using the objective lens only
这已经通过使用衍射透镜在最终屏幕上聚焦选择孔实验性的完成，此方法多数能在移动目标孔后准确完成，然后（重置目标孔后）仅通过目标透镜聚焦样本。