畸变：(1)视觉影像所产生的不良变化。例如阴极射线管的壁角上的影像。
Distortion: (1) an undesirable change in the characteristics of a visual image, such as those images appearing at the corners of a cathode ray tube.
漫步在蜿蜒曲折的山谷之中，高耸的山壁和巨大的岩石往往会在人眼前形成天然的视觉屏障。
When I took a walk along the zigzag paths up the hill, the towering walls and the huge rocks always produced a natural visual screen in front of me.
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