写作思路：根据题目要求，以“如何有效的使用手机”，开头可以写明沉迷于手机的坏处，之后写出几条合理有效使用的建议，正文：
Nowadays, many people are addicted to mobile phones, which will affect students' study, reduce their eyesight and cause eye pain after watching for a long time. Therefore, I suggest that we should use mobile phones effectively and reasonably:
现在有许多人都沉迷于手机，手机会影响学生的学习，能让视力下降，看时间长了还会眼睛疼，因此我建议我们应该有效合理的使用手机：
Do not play mobile phone for more than one hour continuously.
1、玩手机的时间不要连续超过1个小时。
When using mobile phones, you should reduce watching indifferent videos and playing games.
2、使用手机时应该减少看无所谓的视频和玩游戏。
Do not take out your mobile phone to watch while eating or walking.
3、在吃饭和行走等情况下，不要取出手机观看。
In addition to the necessary office and contact, don't rely on your mobile phone to pass the time when you are bored.
4、除了必要的办公和联系，在无聊时间也不要靠手机打发时间。
Mobile phones are sometimes good for our study, but sometimes they are harmful to our study. If we can use the mobile phone properly, then the mobile phone will help us to learn, improve our knowledge, and broaden our horizons. But some people use mobile phones to play games and chat on the Internet, but they waste too much time. They are very harmful to our mind and body, and also affect our healthy development. Therefore, we should use mobile phones reasonably.
