《史记·七十列传·儒林列传》
让太常从百姓中挑选十八岁以上仪表端正的人，补充博士弟子。
太常择民年十八已上，仪状端正者，补博士弟子。
Have Tai Chang select those who are over 18 years old and are physically fit from among the civilians to supplement the students of the PhDs.