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The focal shift analytic expression is derived.
经推导得出焦移解析表达式。
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A function must have the same analytic expression throughout.
一个函数必须处处都有相同的解析表达式。
The function surface can be expressed by analytic expression and constructed easily.
函数曲面可由解析函数表达式来表达，建模方便。
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