牛顿望远镜和反射折射望远镜都有一个次级反射镜(或称斜反射镜)，它们阻挡了一部分主反射镜的发射光。
Newtonian and catadioptric telescopes have secondary (or diagonal) mirrors that obstruct a small percentage of light from the primary mirror.
反射望远镜能够做得很大，远大于折射望远镜。
Reflector telescopes can also be made much, much larger than refractors.
这种类型的望远镜称为反射望远镜，比折射望远镜更具有优势，后者需要用到两个透镜，而且会受到光学畸变效应的影响。
Such telescopes are called reflectors, and they offer major advantages over refractors, which use two lenses and suffer from optical distortion effects.
那些不利用反射的望远镜利用的是折射。
Those telescopes that do not employ reflection use refraction.
那些不利用反射的望远镜利用的是折射。
Those telescopes that do not employ reflection use refraction.
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