aperture of screen 筛孔 ; 节孔
Screen length, incline angle, and screen-aperture are the most important screen parameters, which directly relate to the capacity and efficiency of the screen.
筛面长度、倾角和筛孔孔径是最重要的筛面参数，与筛分机的处理能力和筛分效率有着直接的关系。
If the aperture is circular, a circular spot of light appears on the screen.
如果孔是圆形的，那么在屏幕上出现一圆形光斑。
This formula is not limited by the aperture radius and the distance from the screen and can be used as a theory of near field optics.
推导了圆孔衍射公式，该公式不受孔径大小和到屏距离的限制，可以作为近场光学的理论。
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