objective aperture meaning in Chinese

孔径光圈
物镜孔径

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。