在实际使用中，望远镜有上限和下限放大率。
There are practical upper and lower limits of power for telescopes.
另一个则是需要在天文望远镜的视场和放大率之间进行取舍。
Another is the trade off between a telescope's field of view and its magnification.
另一个则是需要在天文望远镜的视场和放大率之间进行取舍。
Another is the trade off between a telescope's field of view and its magnification.
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