Of course it's a big topic. That's why I only give a very short

来源: Jack_J 于 2020-11-30 10:50:21 [] [旧帖] [给我悄悄话] 阅读数 : (233 bytes)

Of course it's a big topic. That's why I only give a very short introduction. And also my introduction is on a theoretically level. And I don't see any argument from you that can dispute any of my points. 

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