平行于反射镜或折射透镜主光轴的入射光线，镜反射或折射透镜的反射或折射后，其实际光线会聚于的那一点，叫实焦点。
由于有实焦点，放大器置于真空系统中。
The spatial structure amplifier is put in a vacuum because there are real focus points in the amplifier.
在法学理论的关注视角内，这一问题的重要意义不仅在于其现实焦点性，而且在于其后可能蕴藏的巨大理论探讨空间。
In legal science theory attention Angle of view, this question vital significance not only lies in its realistic focal point, moreover lies in which after that possibly contains by discussion space.
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