《资治通鉴·汉纪·汉纪二十七》
王莽想显示太皇太后的威望和恩德已达至盛，超过了前代，以此取悦于太皇太后，就暗示单于，让单于派遣王昭君的女儿须卜居次云到长安侍奉太后，因此而给予单于的赏赐非常丰厚。
王莽欲悦太后以威德至盛，异于前，乃风单于令遣王昭君女须卜居次云入侍太后，所以赏赐之甚厚。
Wang Mang wanted to show that the prestige and grace of the Grand Empress Dowager had already reached prosperity, surpassing the previous generations, and this would please the Grand Empress Dowager. He thus hinted at the Chanyu so that the Chanyu would send Princess Wang Zhaojun’s daughter, Xubujun Cichun, to Chang'an to serve the empress dowager. As a result, the reward given to the Chanyu was very generous.