... principal reaction ==> 主要反应 principal reflection ==> 主反射 principal refraction index ==> 主要折光率 ...
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介绍了主反射镜的一种轻量化结构设计；
A kind of structure design of lightweight of primary mirror is introduced in this paper.
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)。
This is the distance (usually in mm.) from the lens (or primary mirror) to the point where the telescope is in focus (focal point).
调制深度增强，两主反射峰基本不变，而两主反射峰中间的次级峰个数增多，光强增大；
However, when the modulation depth is enhanced, the two main peaks does not shift, but the number of secondary peaks between the two main peaks increases and intensity is enhanced.
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