close down the aperture meaning in English
缩小光圈
Examples
- Further , if you close down the aperture diaphragm , you will observe that objectives of higher numerical aperture " grasp " more of these colored spectra than do objectives of lower numerical aperture
当光栏关小后，数值孔径大的物镜比数值孔径小的物镜产生的光谱状点要多一些。