非常感谢张琪教授给我这样的机会,来同大家交流一下我长期以来关心的问题,不敢说是长期研究的成果,也许再过十年、二十年都是不成熟的想法,因为这样的题目很宏大、很复杂。因此,在此和大家就仅仅做一个讨论和交流,我也会相应地学习很多东西,而获得一些新的补充和想法。我的香港口音,如果在讲座期间你们有因为口音问题造成听不懂的地方,请举手, I am very grateful to Professor Zhang Qi for giving me this opportunity to share with you my long-standing concern about issues that I can not say is the result of long-term research. Maybe another decade or two are immature ideas because The topic is ambitious and complicated. Therefore, I would like to discuss and exchange ideas with all of you here. I will study a lot accordingly and get some new ideas and supplements. My Hong Kong accent, if during the lecture you did not understand because of accent problems, please raise your hand,