【文言书语】
http://www.ruanyifeng.com/blog/2006/06/post_241.html
https://www.douban.com/group/topic/3249444/
https://kknews.cc/history/8bnbxan.html
清人書札,「頓首」多作草體,好像「十五」兩字連寫,而將中間一橫向下拉長,如籤押一樣(見本文插圖清翁同龢書札手跡)。
原文網址:https://kknews.cc/culture/lpb2n9e.html