A parent class to extend function from (plus any "mix-in" classes to simulate multiple inheritance).

用于扩展函数的父类(以及模拟多个继承的“混合”类)。

youdao

A parent class to extend function from (plus any "mix-in" classes to simulate multiple inheritance).

用于扩展函数的父类(以及模拟多个继承的“混合”类)。

youdao