There are four types of computers

There are four types of computers:supercomputers,mainframe computers,midrange computers,and microcomputers.
一、Supercomputers are the most powerful type of computer.These machines are special high-capacity computers used by very large organizations.IBM's Blue Gene is considered by many to be the fastest computer in the world.
二、Mainframe computers occupy specially wired,air-conditioned rooms.Although not nearly as powerful as supercomputers,mainframe computers are capable of great processing speeds and data storage. For example,insuranc companies use mainframes to process informaition about millions of policyholders.
三、Midrange computers also referred to as severs,are computers with processing capabilities less powerful than a mainframe computer yet more powerful than a microcomputer.Originally used by medium-sized companies or departments of large companies to support their processing needs,today midrange computers are most widely used to support or seve end users for such specific needs as retrieving data from a database or supplying access to application software.
四、Microcomputers are the least powerful,yet the most widely used and fastest-growing,type of computer.There are four types of microcomputers: desktop,notebook,tablet PC and handheld computers(See Figure 1-5).Desktop computers are small enought to fit on top of or alongside a desk yet are too big to carry around. Notebook computers,also known as laptop computers,are portable and lightweight and fit into most briefcases.Tables,also known as tablet computers,are the newest type of computer.They are smaller,lighter,and generally less powerful than notebook.Like a notebook, tablets have a flat screen but typically do not have a standard keyboard. Instead tablets typically use a virtual keyboard that appears on the screen and is touch-sensitive. The best-known tablet is Apple's ipad. Handheld computers are the smallest and designed to fit into the palm of one hand.These systems contain an entire computer system,including the electronic components,secondary storage, and input and output devices.Personal Digital Assistants(PDAs) and smartphones are the most widely used handheld computers. Smartphones are cell phones with wireless connections to the Internet. Their growth has been explosive in the past few years.

There are four types of computers:supercomputers,mainframe computers,midrange computers,and microcomputers.
計算機有四種類型：超級計算機、大型計算機、中型計算機和微型計算機。
一、Supercomputers are the most powerful type of computer.
一、超級計算機是最強大的計算機類型。
These machines are special high-capacity computers used by very large organizations.
這些機器是很是大的組織使用的特殊的高容量計算機。
IBM's Blue Gene is considered by many to be the fastest computer in the world.
許多人認爲IBM的Blue Gene是世界上最快的計算機。
二、Mainframe computers occupy specially wired,air-conditioned rooms.
二、主機電腦佔用特別有線空調房間。
Although not nearly as powerful as supercomputers,mainframe computers are capable of great processing speeds and data storage.
雖然沒有超級計算機那麼強大，但大型計算機可以很好的處理速度和數據存儲。
For example,insuranc companies use mainframes to process informaition about millions of policyholders.
例如，被保險人公司使用大型機處理數百萬投保人的信息。
三、Midrange computers also referred to as severs,are computers with processing capabilities less powerful than a mainframe computer yet more powerful than a microcomputer.
三、中程計算機也被稱爲服務器，是一種處理能力不如大型計算機強大，但比微型計算機強大的計算機。
Originally used by medium-sized companies or departments of large companies to support their processing needs,today midrange computers are most widely used to support or seve end users for such specific needs as retrieving data from a database or supplying access to application software.
中型計算機最初被中型公司或大型公司的部門用來支持它們的處理需求，今天，中型計算機被最普遍地用於支持或搜索終端用戶的特定需求，例如從數據庫檢索數據或提供對應用軟件的訪問。
四、Microcomputers are the least powerful,yet the most widely used and fastest-growing,type of computer.
四、微型計算機是最不強大，但使用最普遍和增加最快的計算機類型。
There are four types of microcomputers: desktop,notebook,tablet PC and handheld computers(See Figure 1-5).
微型計算機有四種類型：臺式機、筆記本電腦、平板電腦和手持電腦（見圖1-5）。
Desktop computers are small enought to fit on top of or alongside a desk yet are too big to carry around.
臺式電腦很小，不適合放在桌子的頂部或旁邊，但太大，沒法隨身攜帶。
Notebook computers,also known as laptop computers,are portable and lightweight and fit into most briefcases.
筆記本電腦，也被稱爲筆記本電腦，是便攜式和輕量級的，適合大多數公文包。
Tables,also known as tablet computers,are the newest type of computer.
桌子，也被稱爲平板電腦，是最新類型的計算機。
They are smaller,lighter,and generally less powerful than notebook.
它們比筆記本更小，更輕，並且一般不那麼強大。
Like a notebook, tablets have a flat screen but typically do not have a standard keyboard.
就像筆記本同樣，平板電腦有平板電腦，但一般沒有標準鍵盤。
Instead tablets typically use a virtual keyboard that appears on the screen and is touch-sensitive.
相反，平板電腦一般使用出如今屏幕上且觸摸敏感的虛擬鍵盤。
The best-known tablet is Apple's ipad.
最著名的平板電腦是蘋果的iPad。
Handheld computers are the smallest and designed to fit into the palm of one hand.
手持式計算機是最小的，設計成適合一隻手的手掌。

一、 計算機的種類
計算機有4種類型：超級計算機、大型計算機、中型計算機和微型計算機。
（1） 超級計算機是功能最強的計算機，這些機器的性能特別高，一般有大單位使用。IBM Blue Gene 被許多人視爲是世界上最快的計算機。
（2） 大型計算機安裝在專門佈線和有空調的房間內，儘管他的功能不如超級計算機，但它有很高的處理速度和很大的數據存儲量。例如，保險公司用大型計算機去處理上百萬投保人的信息。
（3） 中型計算機，也稱爲服務器，是功能比較大型計算機弱，但比微型計算機強的計算機。最初，這種計算機由中型或大型公司的部門使用，用於其業務須要。現今，中型計算機更多服務於終端用戶，用於從數據庫檢索數據，或訪問應用軟件等特殊需求。
（4） 微型計算機，是功能最弱而使用最廣和增加最快的計算機。有4種微型計算機類型：臺式、筆記本、平板和手持計算機（見圖1-5）。臺式計算機很小，能夠放在桌面上或桌邊，但搬動起來比較困難。筆記本計算機，有稱膝上電腦，是很輕的、便攜式的，能夠放在公文包裏。平板電腦，又稱平板計算機，是最新型的計算機，它比筆記本計算機更小、更輕，耗電也小。與筆記本計算機同樣，平板電腦也有一個平面顯示屏，但通常沒有標準鍵盤，它使用一個在顯示屏上出現的虛擬鍵盤，而且是觸摸式的。最出名的平板電腦是蘋果公司的ipad。手持計算機是最小的，能夠放在手掌上。這些系統都是一個完整的計算機系統，包括電子部件、二級存儲器和輸入輸出設備。我的數字助理（PDAs）和智能電話是使用最多的手持電腦。智能電話是蜂窩式電話，採用無線方法連入因特網。過去幾年間，這些設備數量劇增。