《北史·本记·卷一》
当时鲜卑国里没有弹弓，众人见到这个场面后都大为吃惊，相互议论说： 太子如今服装都和南方夏人相同，更兼有奇术过人，如果让他继承王位，改变旧俗，我们这些人肯定都没有好处。 
时国俗无弹，众大惊，相谓曰： 太子被服同南夏，兼奇术绝人。若继国统，变易旧俗，吾等必不得志。 
At that time, there were no crossbows in the Xianbei Kingdom. Everyone was shocked to see this and began to gossip, saying, "The crown prince now looks like a southern Chinese and has amazing skills. If he inherits the throne and changes our customs, it will not be good for us."