文档介绍：The History of computer development
5th century BC, Chinese invented the abacus（算盘）.
It is widely used in commerciThe History of computer development
5th century BC, Chinese invented the abacus（算盘）.
It is widely used in commercial trade（商业贸易）, and this is the first calculation tool.
It is also considered the prototype（原型） of a computer.
Until the 17th century, computing devices have a second important step forward(计算设备有一个第二重要的一步).
In 1666, Samuel Morland（塞缪尔·莫兰德） who was English ，invented the addend and subtrahend machine（加数和减数机) .
1832, Babbage and Joseph Clement made a computing device. Its Size nearly as big a house.
1832年，巴贝奇和约瑟夫·克
莱门特发明了计算设备。它的大小几乎一样大的房子
January 1943: In the United States, An advanced computer was developed which weighs 5 tons, 75 million parts.
These computers are mainly used in the war began.
1943年1月：在美国，开发了先进的计算机，它重达5吨，75万件。
这些电脑主要用于在战争开始
1987: A supercomputer release,which can
made 200 million operations per second.
1987年：一个超级版本，它可以每秒运算200万
At present, the type of computer has a lot of friends, according to the computer’