所谓“七下”,是指足下、膝下、阁下、节下、麾下、殿下和陛下。旧时人们书信往来或讲话的开头,为了向对方表示谦恭,根据各自的职位、身份、辈次的差异分别采用这些称呼。足下,辈次职位差不多的人或朋友之间的称呼。唐代大诗人自居易在他写给元稹的一封重要诗歌论文书信《与元九书》里开头称“微之足下”,全信三千多字,竟用了22个“足下”。东汉蔡邕在《独断》中说,群臣士庶相与言曰“足下”,皆谦类。此称始于春秋时代的晋文公。据《东方朔琐语》记载,介之推跟随晋公子重尔流亡各国十九年,重耳返国为君,号文公。由于未能及时给介之推加官赐禄, The so-called “seven downs” refers to the foot, the knee, the lord, the feast, the majesty, the highness, and the subordinates. In the old days, when people began correspondence or spoke, they expressed their humility to each other and used these titles according to their respective positions, identities, and differences in their generations. The name of a person or a friend of almost equal rank. The great poet of the Tang dynasty, Sueyiyi, began by saying in his book “Yuan Jiushu”, an important poetry epistle written for Yuan Zhen. “That is less than enough,” and he believed in more than 3,000 words and used 22 “underfoot” words. The Eastern Han Dynasty, Cai Yong, said in the “Arbitration” that the group leaders and the ignorant “underfoot” are all humility types. This was called Jin Wengong from the Spring and Autumn Period. According to the “Eastern Triage” record, Jiezhi’s push followed Jin Gongzi’s heavy exile in the country for nineteen years. Due to the failure to promptly introduce the official to the Luke,