定义
偏离正规的，正确的或自然的。在光学里，由于透镜系统的缺陷导致光学成像偏离近轴成像规则，称为像差。
English Expression
Aberration
Definition
Deviation from what is normal, right or natural. In optics, defects of a lens system that cause its image to deviate from the rules of paraxial imagery.
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