《容斋随笔·卷五·元二之灾》
查考《章帝本纪》，可以看出，本纪中所纪的从建初三年以后各年的祥瑞，与王充所记的完全相同，显而易见，所谓的元二，乃是指建初元年和二年。
考之本纪，所书建初三年以后诸瑞皆同，则知所谓元二者，谓建初元年、二年也。
By studying the "Annals of the Emperor Zhang", it can be seen that the lucky omens recorded in the Annals after the third year of the Jianchu period are identical to those recorded by Wang Chong. It is obvious that the so-called Yuan Two refers to the first and second years of the Jianchu period.