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。
His primary duty is to be the focal point of attacking moves and he is required to both score and create goals.
主要任务是作为进攻的焦点，要求能够进球和制造机会。
His primary duty is to be the focal point of attacking moves and he is required to both score and create goals.
主要任务是作为进攻的焦点，要求能够进球和制造机会。
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