Now more and more families have their own computers.The computer is one of the most helpful inventions.Computers have many advantages,but they also have many disadvantages .On the one hand,you can search almost anything conveniently by computer.When you use computer to work,you can save a lot of time . Some people say that t
Computers are popular in our lives.It's hardly to imagine a world without computer. First of all.Scientists use computers to forecast weather tomorrow.It need 3 years to calcul
