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 first step in that plan is to distance the singer from Neverland, which, as a focal point for the trial, is indelibly linked with those charges in the eyes of the public.
这个计划的第一步是，将这名歌星和梦幻岛庄园分割开来。 这个庄园作为当年审判的焦点，在公众的眼里，永远和那些可怕的指控有着联系。
Focal point is, the distance between the two is the focus of the focal length.
定点是焦点，两焦点的距离是焦距。
This text is to compare Frensnel s zones plate with ordinary lens, on the axle point of light intension and focal distance as well as their difference in use.
当光通过菲涅耳半波带与普通透镜时，可发现在轴上点的光强、焦距以及用途上的不同。
This text is to compare Frensnel s zones plate with ordinary lens, on the axle point of light intension and focal distance as well as their difference in use.
当光通过菲涅耳半波带与普通透镜时，可发现在轴上点的光强、焦距以及用途上的不同。
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