... principal reaction ==> 主要反应 principal reflection ==> 主反射 principal refraction index ==> 主要折光率 ...
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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).
刚开始时主反射镜的瑕疵造成影像模糊；1993年另一次太空任务修正此瑕疵及其它问题。
A defect in the primary mirror initially caused it to produce fuzzy images; in 1993 another shuttle mission corrected this and other problems.
介绍了产生结构非线性的主要来源，并在接触理论的基础上对主反射镜组件进行了合理的有限元建模。
The main source for structural nonlinearity is summarized, and a FE model for the primary mirror subassembly of a collimator is established on the basis of contact theory.
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