... 第一极体 first polar body 第一焦点 primary focal point 第一焦距 primary focal length ...
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D(Diopter)＝Vergence 屈光度＝1／距离(公尺) 光线的成像及主光束原理 主焦点(Primary focal point)是能在无穷远处形成影像(平行光)的光点。 第二焦点(Secondary focal point)是光源在无穷远处(平行光)，形成影 像的光点。
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前主焦点 anterior principal foci; anterior principal focus; primary focal point; primar ..
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This is the distance (usually in mm.) from the lens (or primary mirror) to the point where the telescope is in focus (focal point).
就是从透镜(或者主反射镜)到焦点的距离，通常单位是毫米(mm)。
The research on the behavioral norms of primary and middle school students is like to seize the focal point.
对中小学生进行日常行为规范的研究，就如牵牛抓住了牛鼻子。
A discussion is given of the method of determining the position of the focal point when the measured lens is with primary astigmatism. The measuring results are also included.
被测物镜有初级象散时确定焦点位置的方法，并给出了测量结果。
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