If you have glasses you know that optically focus has to do with bringing the light to a focal point in the back of your eye.
如果您戴眼镜，您就会知道，从光学的层面理解，焦点的意思是，将光线汇聚到您眼底的一点上。
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)。
You need a focal point - like when a photographer chooses the central subject of a picture, the primary object on which all eyes focus.
你需要重点式选择时的中心主题摄影图片、主要对象是所有目光的焦点。
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。
It USES a linear LOD system, and, of course, because when the camera moves away from the focal point, the terrain needs to be regenerated to 'focus' on the new focal point.
它使用LOD系统，当然，因为摄像机会不停地移动焦点，地形也需要不断的根据焦重新点生成三角形。
The principle of solar energy: focus on a focal point to produce heat.
⊙、太阳能的原理：集中在一个焦点上才能产生热。
The principle of solar energy: focus on a focal point to produce heat.
⊙、太阳能的原理：集中在一个焦点上才能产生热。
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