记得胡宝国先生在给田余庆先生的《拓跋史探》作书评时曾用《在题无剩义之处追索》作为篇题,其意在说明古史研究之难。诚然,限于材料,大多问题已被探讨、开发殆尽,真可谓是“题无剩义”了。然正如胡先生所说,面对老问题,总有人不满于旧有之答案,“在一般人停下来的地方继续穷追不舍。”正因如此,学术研究方得以 I remember Mr. Hu Bao-guo in Mr. Tian Yuqin’s “Tuoba Shi Tan” as a book review has been “no problem with the left where to recite” as a chapter, which intended to illustrate the difficulties in the study of ancient history. Indeed, limited to materials, most of the problems have been explored, developed exhausted, really can be described as However, as Mr. Hu said, in the face of old problems, there are always people who are not satisfied with the old answers, “and continue pursuing where ordinary people have stopped.” It is for this reason that academics have been able to