《颜氏家训·音辞篇》
到了郑玄为《六经》作注解，高诱解读《吕氏春秋》和《淮南子》，许慎写《说文解字》，刘熹编制《释名》的时候，才开始用譬况、假借的方法来为文字正音。
逮郑玄注六经，高诱解吕览、淮南，许慎造说文，刘熹制释名，始有譬况假借以证音字耳。
It was not until when Zheng Xuan annotated the 《Six Classics》, Gao You interpreted 《Lü Shi Chun Qiu》 and 《Huainanzi》, Xu Shen created 《Shuowen Jiezi》, and Liu Xi compiled 《Shi Ming》 that the methods of analogy and borowing characters to indicate the correct pronunciation of characters started to be used.