1) mini-hole board
小孔遮光板
1.
Based on the teaching courts,we lead out a new methord and it has been provided that use the mini-hole board can take up the speed and gain well effects.
文章提出了新的快速调节的办法,实践证明,将小孔遮光板引入实验,大大提高了调节速度并收到良好的教学效果。
2) aperture blocking
孔径遮光
3) viser board
遮光纸板
4) screening for lights
限光遮板
5) front diaphragm
前遮光板
6) Perforated shading panels
穿孔遮阳板
补充资料：阿克伦德氏遮光板