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典型反射镜头的环状光圈导致失焦影像呈现明显的“亮环”效应。
The annular aperture of typical mirror lenses results in out-of-focus images with a pronounced 'bright ring' effect.
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影像上表现为环状强化，囊壁增厚。
Imaging studies show ring enhancement and capsular thickening.
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