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 curved energy transmission surface defines a focal point (8) and a focal length (9).
这种弯曲的能量传递表面限定焦点(8)和焦距(9)。
This curved energy transmission surface defines a focal point (8) and a focal length (9).
这种弯曲的能量传递表面限定焦点(8)和焦距(9)。
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