The effect of the computer--(2)

The computer is a kink of powerful tool to help us work effectively. The computer computes fastly. And if you want the computer to do something, it will not say no. It will do that well step by step without any argument.
The first advantage of the computer is speed. Many componies develop many softwares to help us work effectively. In the past, the accounters completed the balance sheet with the calculator. Now they just enter the numbers and tell the computer how to calculate the numbers. And then the computer only spend several seconds to calculate. That is not only fast but also correct. Besides, you do not have to pay for it.
The second advantage of the computer is free. I do not mean that the computer is free. I mean that I can easily find a lot of study resources on the Interent. Like English listening,talking,reading, and writing. You can get that without any money. And the important thing is that you can interact with the websites.
The another advantage of the computer is convenience. If we want to buy something only in America, we do not take airplane there to buy it. We can use the computer to contact the Interent. Then you just need to find the shopping websites and buy it. After several days, the product will be sent to your home.
But the computer also has disadvantage. Like some children spand too much time playing computer games. That will let them not only do not complete theit homework but also do hurt their eyes.
In conclusion, having a computer in the 21st centory is very necessary for you. These advantages have affected our life deeply. Not only it is convenient for you, but it is helpful to your life as well. I can not think what will like if the computer is out of our lives. But the disadvantage we need to think about it,too.