translation.en: Today, if I could respond to my students with a letter of my own, which is of course impossible, I would tell them this: "My dear gentlemen, It's been a bit over three years since I last saw you.
translation.zh: 今天，如果我能写一封信回复我的学生们， 当然这是不可能的， 我会告诉他们： “亲爱的绅士们," "我上次见到你们已经是3年前了，"