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通过前一章的叙述,唐代青海湖东边、南边的地势,以及唐朝方面所设诸城塞的位置,已大略明确。在此基础上,本章上溯封南北朝,探讨当时在这个地方异常活跃的吐谷浑所设置的诸城塞,及隋唐对吐谷浑的作战线路。但为了首先确定吐谷浑的最初根据地——河州(甘肃临夏市)西边的桴罕原这一地点,得稍许迂远,从大夏河流域的考察开始。
Through the narration of the previous chapter, the location of the eastern and southern Qinghai Lake in the Tang Dynasty and the location of the Zhucheng plug in the Tang Dynasty has been largely clear. On this basis, this chapter traces the closure of the Southern and Northern Dynasties, and explores the Zhucheng plug set by Tuyuhun, then unusually active in this place, and the battle lines of the Tuyuhun in Sui and Tang Dynasties. However, in order to first determine the site of Qionghan in the west of Hezhou (Linxia City, Gansu Province), the initial base of Tuyuhun, a little bit far away from the Dashahe River basin was investigated.