1. 电脑的优越性
2. 电脑的应用
3. 电脑的局限性

 With the development of computer-technology, computers are becoming more and more popular with people all over the world. The frequency of using computer has rised year by year. The advantages taken over by computers can be seen everywhere.
  Due to the comprehensive applications of the computer, it has been gradually taking place of human beings in some areas.Such as people can use computers to compose, to purchase godds, and to hold meetings. What's more, computer can greatly enhance people's working efficiency.
  However,everything has its two aspects. Computer also has some disadvantages.Take some examples.Since computer games now have been more prevalent among students,they almost spend more than 6 hours for entertainment on computer,and not study any more.Next,many people now like to communicate with their friends on line, and they meet less frequent than ever before.As a result, the lack of the language speaking leads to their expression barriers.In short, we should make the best use of its good aspect to get further more impruments.