写作思路：根据题目要求，以“手机对学生的危害”作为主题，写出具体的弊端，最后进行总结，正文：
Today, I will talk about the harm of mobile phones to primary school students.
今天，我来说一说手机对小学生的危害。
Games on mobile phones are usually used by sellers to attract customers. The game is not good, it will make primary school students indulge in it, resulting in plummeting grades.
手机上的游戏，通常是销售商用来吸引顾客的。游戏并不好，它会使小学生沉迷于其中，导致成绩直线下降。
Playing mobile games often will seriously damage your eyesight and waste your hard-earned money.
经常玩手机游戏还会严重损害视力，也会浪费爸爸妈妈辛苦挣来的血汗钱。
Teenagers play games to become highly regarded people in another virtual world, and they feel that vanity has been satisfied.
青少年玩游戏是在另一个虚拟世界里成为万众瞩目的人上人，他们觉得虚荣心得到了满足。
But after all, virtuality is false and does not really exist, so it is better to put a lot of time and energy into real life.
但虚拟毕竟是假的，没有真正存在，倒不如把大把时间和精力放到现实生活中来。
The advantages of mobile phones outweigh the disadvantages, or the disadvantages outweigh the advantages. It depends on your own opinions and understanding of mobile phones at different levels.
手机利大于弊或弊大于利全靠你自己对于手机不同程度的见解和认识自行做出的选择。
For one thing, Not only can they harm your eyes,making you be short in sight,but also scientists have proved that they can also affect your brian as well. For another,it is a waste of time to usse mobile phone too much,which will makes you addicted. Moreover, mobile phones can also spread some false information to cheat you. last but not least,it can be a waste of energy and money.
So ,only when you face this problom carefully,can you avoid its bad effcets.本回答被网友采纳