... half side-view 半侧面 angle of half field-of view 半视场角 half field-of-view 半视场 ...
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angle of half field-of view 半视场角
half-shadow field of view 半荫视场
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For example, a telescope with a focal length of 2000mm has twice the power and half the field of view of a 1000mm telescope.
比如，与焦距为1000mm的望远镜相比，2000mm焦距望远镜的放大率和视场范围分别是前者的2倍和1/2。
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