我是一个很用功的学生,可高三那年冬天,一下自习,哪怕当时只有9点多一点儿,我就要跑回寝室,钻到被子里。因为我是班上惟一没有毛衣穿的人。爹妈知道儿子没毛衣,但无能为力,只能在信上一次次惭愧地嘱咐我:饭多吃些,能顶寒!天气一天比一天冷,我后来实在坚持不下去了。我给妹妹写? I am a very hard-working student. During the third year of my senior year, I studied for a self-study. Even if I had only a little more than 9 at the time, I would have to run back to the bedroom and get into the quilt. Because I am the only person in my class who has no sweater. Father and mother know that his son did not sweater, but powerless, and can only be ashamed of me on the letter again and again told me: eat more rice, can be cold! The weather is cold day by day, I really could not go on. I write to my sister?