I don't know why what I wrote apeared all question marks!
So I have to use English to do the same thing:
No matter what 6.4 really is, never forget it, as it has already happened and exists in our history as an important big event, and it has been affecting our life. Like what someone above said, many people have already benefited from it.
王丹:唯一后悔的是不能回家照顾父母