primary section
主切刃法截面 [机] cutting edge normal plane
主切削平面 tool major cutting edge plane
但是在分数域上，要想提取所要精度的模糊函数主脊切面，则其计算量很大，不利于实际应用。
If want get a precision result of main ridge slice of ambiguity function, it requires huge computational complexity, so it is disadvantage to practical application.
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