提纲：

1. 网络带来的便利和沉迷的危害

2. 沉迷网络对身体健康的影响

3. 沉迷网络对心理健康的影响

4. 沉迷网络对学业和职业发展的影响

5. 如何避免沉迷网络

正文：

1. The convenience and harm brought by the internet addiction

The internet has brought us a lot of convenience, such as online shopping, online communication, and online entertainment. However, it also brings some harm, especially when people become addicted to it. Internet addiction can cause many negative effects on both physical and mental health.

2. The impact of internet addiction on physical health

People who spend too much time on the internet may suffer from various physical health problems, such as obesity, eye strain, and headaches. Moreover, they may have a sedentary lifestyle, which can lead to cardiovascular diseases, diabetes, and other health issues.

3. The impact of internet addiction on mental health

Internet addiction can also negatively affect mental health. People who are addicted to the internet may experience anxiety, depression, and other mental health problems. They may also have poor social skills, which can lead to social isolation and loneliness.

4. The impact of internet addiction on academic and career development

Internet addiction can have a negative impact on academic and career development. Students who spend too much time on the internet may have poor academic performance, while employees who are addicted to the internet may have low productivity and poor work performance.

5. How to avoid internet addiction

To avoid internet addiction, people can set limits on their internet use, such as setting a time limit for online activities and avoiding using the internet before going to bed. They can also engage in offline activities, such as sports, hobbies, and socializing with friends and family. Furthermore, people can seek professional help if they find it difficult to overcome internet addiction on their own.

结尾：

In conclusion, while the internet brings us a lot of benefits, it also brings some harm, especially when people become addicted to it. Therefore, it is important for us to be aware of the negative impacts of internet addiction and take steps to avoid it.