【正文】
The author stated her aim at first clearly. Of course, the aim is close together with her reference research. The object that is studied is stated clear and the assumes are rooted in ultimate principle. Also there are some ultimate principles to prove that this is a very important research. The reference form fits the national norm. They are allround reflect the significant information source in this field. The acknowledgements is allround. She thanks a lot of people, in it we can see the sincere thanks form author to family and her teachers.. I learn that a qood paper is c