Understand the exist of spherical aberration by drawing comet around ideal focus;
画出理想焦点附近的星点图，理解球差的存在；
The performance individuality drawing creation, this kind of ideal condition is unique.
表现个性的绘画创作，这种意境是独特的。
The performance individuality drawing creation, this kind of ideal condition is unique.
表现个性的绘画创作，这种意境是独特的。
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