《汉书·志·五行志中之上》
后来汉成帝化装为民私下出游，常常跟富平侯张放一起自称富平侯的家人仆隶，到阳阿公主家寻欢作乐，看到舞女趟飞燕并爱上她，所以说 燕燕尾涎涎 ，好漂亮的外貌啊。 张公子 即富平侯。 木门琯琅根 ，是指宫门上的铜环，意思是将要尊贵了。
其后帝为微行出游，常与富平侯张放俱称富平侯家人，过阳阿主作乐，见舞者赵飞燕而幸之，故曰 燕燕尾涎涎 ，美好貌也。 张公子 ，谓富平侯也。 木门仓琅根 ，谓宫门铜锾，言将尊贵也。
Later, Emperor Cheng disguised himself as a private citizen and secretly went out to travel, often claiming to be a servant of Marquis Fuping Zhang Fang, and went to the home of Princess Yang'a to seek pleasure, and when he saw the dancing girl Tiao Feiyan, fell in love with her, so the nursery rhyme said: The swallow's tail is dripping, so beautiful. Zhang, the Marquis, was Marquis Fuping. Wood Gate door, Lang ring root, refers to the bronze ring on the palace door, meaning that he was soon to be honored.