然而，凯什兰博士并不为此担心，因为他的菲涅尔望远镜将会在太空中。

But Dr Koechlin does not worry about that, because his Fresnel telescope will be in space.

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设计结果与传统凯涅尔目镜的光学性能进行了分析和比较。

The optical performance of the hybrid eyepieces are studied and compared with the Kellner eyepiece.

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