一方面为一个类重载运算符增加了代码的物流和可读性。
On one hand overloading operators for a class you have created can help with logistics and readability of code.
若要在自定义类中重载运算符，您需要在该类中创建具有正确签名的方法。
To overload an operator on a custom class requires creating a method on the class with the correct signature.
除赋值运算符外， 重载运算符可由派生类继承下去。
Outside dividing assignment operation accord with, heavy carry calculates Fu Ke by derive kind successive go down.
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