《汉书·传·张冯汲郑传》
况且下面仿效上面快于影子随形和回响之应声，陛下办什么不办什么，不能不谨慎啊！ 文帝答应说： 好！ 
且下之化上，疾于景，举错不可不察也。 文帝曰： 善。 
In addition, the one under act fast than the shadow that company shapes and reverberation has that should sound, what your Majesty do not what do not do, not can not careful ah! The king of the kingland agreed to say: good!