Most people can formulate a mental picture of a computer, but computers do so many things and come in such a variety of shapes and sizes that it might seem difficult to distill their common characteristics into an all-purpose definition. At its core, a computer is a device that accepts input， processes data， stores data, and produces output, all according to a series of stored instructions.
Computer input is whatever is put into a computer system. Input can be supplied by a person， by the environment, or by another computer。 Examples of the kinds of input that a computer can accept include the words and symbols in a document, numbers for a calculation, pictures， temperatures from a thermostat， audio signals from a microphone， and instructions from a computer program. An input device, such as a keyboard or mouse， gathers input and transforms it into a series of electronic signals for the computer.
  In the context of computing, data refers to the symbols that represent facts, objects， and ideas. Computers manipulate data in many ways， and we call this manipulation processing。 The series of instructions that tell a computer how to carry out processing task
s is referred to as a computer program， or simply a "program.” These programs form the software that sets up a computer to do a specific task。 In a computer, most processing takes place in a component called the central processing unit (CPU）,  which  is  sometimes  described as the"brain” of the computer。
    A computer stores data so that it will be available for processing. Most computers have more than one location for storing data， depending on how the data is being used. Memory is an area of a computer that temporarily holds data that is waiting to be processed， stored, or output. Storage is the area where data can be left on a permanent basis when it is not immediately needed for processing。
Output is the results produced by a computer. Some examples of computer output include reports， documents, music， graphs， and pictures. An output device displays, prints， or transmits the results of processing.
    Computers are versatile machines, which are able to perform a truly amazing assortment of tasks， but some types of computer are better suited to certain tasks than other types of
computers. Computers can be categorized as personal computer, handheld computers， workstations， mainframes, supercomputers ， and servers.
大多数人可以制订一个电脑精神的图片，但电脑做很多事情，出现这样的形状和大小不同，它似乎难以提炼成一个全能的定义,它们的共同特点.在其核心，一台计算机是一种装置，它接受输入,处理数据，存储数据,并产生输出，根据对所有存储一系列指示。
什么是计算机输入到计算机系统的压力。输入可提供的一人，由环境,或由另一台计算机。对输入的各种例子，一个计算机可以接受包括文字和符号的文件，规定计算，图片,从恒温器的温度数字,音频信号从一个麦克风，从电脑程序指令。一个输入设备,如键盘或鼠标,集输和转换成一个电子信号的计算机的一系列。
在计算中，数据是指以符号代表的事实，对象和想法.计算机操作在很多方面的数据，我们称之为操作处理。一系列的指令,告诉计算机如何进行处理任务，被称为一个计算机程序，或只是一个“程序”。这些方案形成了软件,建立了计算机做特定的任务。在计算机中,大部分处理发生在一个组件的地方称为中央处理单元（CPU），有时为“大脑的计算机”来形容.
sort out your computer翻译
    计算机存储数据，以便它会被用作处理可用。大多数计算机有多个用于存储数据的位置，这取决于数据如何被使用。内存是计算机的一个领域,数据是暂时持有等待处理，存储或输出。在数据存储,是可以在一个地区长期离开时,没有立即处理所需。
输出是由电脑产生的结果。电脑输出的一些例子包括报告，文件，音乐，图形,图片。输出设备显示，打印，或传送的处理结果。
    电脑是多功能机，它能够执行各种各样的任务十分惊人，但某些类型的计算机更适合比其他类型的计算机的某些任务。计算机可以被归类为个人电脑，掌上电脑,工作站,大型机，超级计算机和服务器.
A personal computer is a type of microcomputer, designed to meet the computing needs of an individual。 It typically provides access to a wide variety of computing applications， such as word processing, photo editing, e-mail, and Internet access。 Personal computers are available as desktop computers or notebook computers。 个人计算机是一种微型计算机，它能够满足个人的计算需要，它特别提供了适应各种各样计算应用的方法，比如说文字处理、相片编辑、以及进入互联网，个人计算机可以被当作台式计算机以及笔记本
电脑一样使用
A handheld computer is designed to fit into a pocket, run on batteries, and be used while you are holding it。 Also called a PDA （Personal Digital Assistant） and a palmtop computer, a computer in this category is typically used as an electronic appointment book, address book， calculator， and notepad。 With its slow processing speed and small screen， a handheld compute is not powerful enough to handle many of the tasks that can be accomplished by desktop or notebook personal computers。 A handheld computer is designed to  bea computing accessory， rather than your primary computer掌上电脑被设计成能够放进口袋,能依靠电池工作,并且当你放在手上它时能够运行。它也被称作PDA(个人数字助手）和手掌上的电脑，这种类型的计算机典型性地被作为电子图书、通讯录、计算器以及记事本来使用。由于其速度较慢且显示屏较小,所以掌上电脑功能不够强大无法执行台式计算机及个人电脑所能完成的很多任务。掌上电脑旨在成为计算助手而非成为你的主要计算机。

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