My dear brother,
I've heard that you often take your mobile phone to your school. It's not suitable for you to do this. I write this letter to give you my opinion about taking mobile phone to school.
Nowadays it's very common for students to take mobile phones to school, but many students don't know how to use their mobile phones correctly. As a middle school student, it's not good to have too much communication with friends outside school because they are not students and some of them have many bad habits which will do harm to you. You should study wholeheartedly in school.
I hope you can learn some lesson from others' examples and do not take your mobile phone to school anymore.
Your elder brother
Li Dong是有关于一个杂志社编辑看到当事人的来信（关于学校规定不能带手机使他烦恼），因而给他回信。在信中发表自己的看法和建议！再麻烦一下，拜托啊~~~~Now as the society is developed,many students have mobiles now.Especially in the middle school,many boys and girls take the mobiles in the class. The music often rised during the classing.This make the teachers very confused.I think all of us are very young,no need the mobile.If your parents really have many money and bought a mobile for you. Please shut off before you go into the classroom.