What Is a Computer   

　　What is a computer? Generally speaking, a computer is an electronic and machinery equipment, which has many uses, such as aclearcase/" target="_blank" >ccepting, manipulating, storing, and representing information. It can replace people in dull, time-consuming, routine tasks．   
　　Inside the computer, there is a complicated.network of electronic circuits that control switches or levels. They both have two possible states：For the switches are on or off and the levels arc high or low that is the reason why binary is widely used to represent information in computer.   
　　Computers can store and process not only letters－numbers and characters but also sounds，image, and information of other forms．Though they cannot make suggestions for people, they can do calculating, communicating, word-processing, information call ectingand some other management. Under the control of the program, computers even can do some great things．Such as logic inference, aiding decision, aiding design. Theory proving, etc.
　　The reason why computers can work in a rather high speed is very simple: t is an electronic ma-chine．For example, as soon as you turn on the switch the light gets light at the same time．How fast the speed of the current is! Computers do all they can do instantaneously.   
　　Computers are powerful．They can solve problems for people by carrying out instructions given to them. A sequence of instructions describing how to perform a certain task is called program. Before the programs in a computer can be executed, they must be converted into a limited set of simple instructions．And then the electronic circuits of each computer can recognize and directly execute them.   
　　Computers have circuits which can make decides．Therefore, they can solve a series of problems and make hundreds, even thousands, of logical decisions without becoming tired or bored, but they have no originality.   
　　There are times when a computer seems to operate like a mechanical "brain"，but its achievements are limited by the minds of human beings．It is a useful tool for people.

翻译：

什么是计算机   

　　什么是计算机呢？总的说来，计算机是一种用途非常广泛，能够接收、加工、储存和传递信息的电器设备。它能够代替人们从事那些单调的，费时的日常工作。
　　计算机内部具有复杂的电路网络，它可控制开关或电平，这两者都有两种状态：开关的通、断，电平的高、低。这就是在计算机中广泛使用二进制来表示信息的原因。   
　　计算机不仅能够存储并处理字母、数字和字符信息，也能存储并处理诸如声音、图像等其它形式的信息。尽管计算机不会替人们出主意，但它能够进行计算机，通讯，文字处理，信息收集和其它的一些管理。在程序的控制下，计算机还能胜任诸如逻辑推理、辅助决策、辅助设计、定理证明等工作。   
　　计算机能极为高速工作的原因很简单，因为它是一台电子装置。拿开电灯举个例，当你合上开关，几乎同时电灯就亮了。电流速度太快了！计算机在瞬间完成它们所能做的事情。   
　　计算机是极有能力的。它们能通过执行所给的指令为人们解决问题。一系列描述怎样执行某个任务的指令叫程序。在（某台）计算机中的程序被执行之前，它们必须转换成一系列简单的指令，然后计算机中的电子线路就能识别并直接执行它们。   
　　计算机具有进行逻辑判断的毛路。所以，它能解决一系列问题．做出成百甚至上千个逻辑判断而不感到厌烦，但它们没有创造力。   
　　计算机有时会像机械脑一样二作，但它的能力却受到人类大脑巴限制。所以，计算机是人类有用的工具。