Here I have to emphasize that Mr. Wang has excellent communication tendencies and skills, which is uncommon in Chinese students. As I know, usually he read papers and contacted with the authors of papers he concerned for academic exchange, even collaboration all by himself. His international collaborative relationship with Prof. Vincenzo Crupi (in Italy) is just a good example.
但也不好说,有的大教授也会非常热心的。记得有一次我同时给文章的两个作者都发信过去,他们都给了我回复,其中那个大教授的回复是:About your question, Prof. ** have already replied you. However, here I'd like to give you my understanding....... If you need any specific advice from me, do not hesitate to write me directly.