区域运算:

Ø 并:union1()、union2();

Ø 交:intersection();

Ø 差:difference();

Ø 补:complement();

========================================

转自:https://www.cnblogs.com/bile/p/8600332.html

区域运算:

Ø 并:union1()、union2();

Ø 交:intersection();

Ø 差:difference();

Ø 补:complement();

========================================

转自:https://www.cnblogs.com/bile/p/8600332.html

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