唐宋时期,中原王朝的周边地区曾先后出现过几个较为强盛的少数民族政权,包括辽、金、夏和大理、吐蕃等,它们从东北、西北到西南,形成了一个以畜牧业为主的半月形经济圈,其政治体制和文化结构等方面都与唐、宋两朝存在着密切联系,甚至职官制度和文化模式也皆 During the Tang and Song dynasties, there were several relatively powerful ethnic minority regimes in the surrounding areas of the Central Plains dynasty, including the Liao, Jin, Xia and Dali counties and Tubo, etc. They formed a mainly livestock husbandry from northeast, northwest to southwest Of the half-moon economic circle, its political system and cultural structure and other aspects of the Tang and Song dynasties are closely linked, and even the official system and cultural model are