西汉时期,位于长安京畿地区的三辅郡虽有明确的疆界,但并非从来就辖有其边界以内的全部县邑。与三辅平行,一度还存在过一个隐形郡——“太常郡”,管辖位于三辅之中的诸陵县。太常作为一郡至少存在了大半个世纪,对西汉尤其是关中地区的经济、政治、文化产生过深远的影响。 During the Western Han Dynasty, although there were definite boundaries in Misu-gun in the Chang-an-Gyeonggi area, it did not always govern all the counties within its borders. Parallel with the three supplements, once there is an invisible county - “too often County”, which is located in the three supplements Zhu Ling County. Too often as a county has existed for at least half a century, and has had a profound impact on the economy, politics and culture of the West Han Dynasty, especially the Central Shaanxi Province.