the use of powerpoint英语作文？

With the development of technology, almost every school have computers. And there is not doubt that computers can help study and teaching. Teachers can use computer software to help teach. They can use powerpoint to show students the content of classes. Computers also help students a lot, students can use computer to search information. Students can also operate computers in computer class. However, computers also have disadvantages. For example, computers may be too expensive for some school in poor area. And students may play computer games in class. As we know, there are something harmful for students on internet. Students may be influenced by those things. In my opinion, computers are necessary. But we should use it to study instead of playing.