圆周的对称点与球透镜的齐明点虽然有一个相同的表达式，但这两类不同范畴的共轭点有着内在的差异，分析这种差异，有利于更好地理解它们。
The circular symmetric point and the apalanatic point of spherical lens have one same expression, however the two kinds conjugate point are belong to difference category.
圆周的对称点与球透镜的齐明点虽然有一个相同的表达式，但这两类不同范畴的共轭点有着内在的差异，分析这种差异，有利于更好地理解它们。
The circular symmetric point and the apalanatic point of spherical lens have one same expression, however the two kinds conjugate point are belong to difference category.
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