有一句成语或一句话我们很熟悉:就是“刮目相看”,或“士别三日,当刮目相看”。但典故出自何处,那就不一定人人都知道了。这是关于吕蒙的故事。吕蒙年少时不读书,到后来管事时,不能写,只有以口代笔面陈大事,很不方便。同僚们在这一方面都不怎么瞧得起他。如蔡遗、鲁肃就是这样? There is an idiom or a word we are familiar with: that is, “admiration”, or “Do not three days, when admiration.” But where the allusions came from, not everyone knew it. This is the story of Lu Meng. When she was young, she did not study until later when she was in charge of management. Fellow colleagues do not think much of him in this respect. Such as Cai left, Lu Su is like this?