1. a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror. 
   具有抛物面主镜和双曲面次镜的一种折射式望远镜；光线被集中到主镜中心的孔径。
2. It was found that the reflecting power of the 60-inch mirror was almost doubled because of the new film, and now equalled that of the 100-inch mirror. 
   人们发现，这个60英寸的镜面由于这种新涂层，反射能力几乎是原先的两倍，相当于100英寸的望远镜。
3. If there were any inhabitants of the moon, they would see our earth reflecting the light of the sun, again like a huge mirror hung in the sky. They would speak of earthlight just as we speak of moonlight. 
   假如月亮上有居民，他们也会看到我们反射太阳光的地球同样就像一个巨大的镜子悬在空中，他们也会像我们谈论月光那样谈论地球光。
4. When this glass was backed with a covering of lead or tin, a mirror reflecting at least some truth as to color resulted, but not so much could be said for the truth in respect to the form of its reflections. 
   当这种玻璃背面涂上一层铅或锡时就成了镜子，这种镜子至少反映出了各种颜色的一些真实情况，但就反映的形状而言，并无真实可言。
5. mechanical construction of reflecting telescope 
   反射望远镜的机械结构

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