2014職稱英語理工C閱讀理解原文第三篇

　　概括大意與完成句子 第四篇 Compact Disks

　　2014年職稱英語真題理工C閱讀理解第三篇

　　If someone says to you your music CDs don't really hold any music on them, and they only have numbers recorded on them, you may not believe it. In fact, he is right in that sound is actually recorded onto the CDs as special numbers ― a digital code.1 The code is pressed onto the CD as bumps on a long spiral track almost five kilometers long. These bumps are an average of 0.5 microns wide.

　　The light is reflected back to a receiver that records how the laser light bounces back. This lets the CD player2 turn the reflected light back into the original code. This means you can hear the original code as music.

　　Digital codes are used with many technologies. E-mail needs these kinds of code numbers. Space probes communicate with their ground station on earth using digital codes. Bar codes are read as digital codes in computer systems. Digital communications with cell phones need digital codes. Weather radios also tune into specific signals using these codes.

　　There are many types of compact disks. One format is called CD-RWs. They can be recorded on and re-recorded on(rewritten on)as you would do with a floppy disk3. Another format is the CD-ROM. The technology for recording on these disks is different from other CDs. These CDs have a dye layer that the CD writer can darken or leave clear. The clear and dark spots are the digital code. CD-ROM stands for Compact Disc ― Read Only Memory4. This disk is like a "super" floppy disk that can hold lots of information. One CD-ROM can hold the same amount of data as 500 floppy disks. Information is permanently recorded onto it. Computer games and other programs are considered to be CD-ROMs.

　　CDs were first sold to the public in 1982　These CDs still play well and sound fine. Current CDs are expected to last between 70 to 200 years. Of course, you can make sure your CDs last a long time by taking care of them.

　　Science keeps on developing. It may not be many more years before a completely new technology is invented5 and introduced to the public for music recording. In the meantime, there is no doubt you will continue to enjoy listening to your favorite music on CDs6 and playing your favorite computer games on CD-ROMs.

　　譯文：光盤

　　如果有人告訴你，你的光盤上實際并沒有音樂，有的只是一些錄下來的數(shù)字，你也許不會相信。但實際上，他說得對，因為其實聲音是以特殊的數(shù)字形式，即數(shù)碼，刻錄在光盤碟片上。這些數(shù)碼被強行刻在光盤上，就像一條5公里長的曲折道路上有一些凸起一樣。這些凸起平均 0.5微米寬。

　　當光盤轉(zhuǎn)動時，一束極小的激光射到這些凸起上，光束被反射到接受器上――該接受器是用來記錄了激光是如何彈回來的。這樣一來，光盤閱讀者器就能把反射來的光變成最初的數(shù)碼。這也就意味著這些最初的數(shù)碼傳到你那里，就成為了你聽到的音樂。

　　數(shù)碼可用于許多技術(shù)。電子郵件依賴這些編碼，空間探測器在與地面站聯(lián)絡(luò)時也要用到數(shù)碼。計算機系統(tǒng)可以將條形碼讀為數(shù)碼。使用手機進行的數(shù)碼交流也需要數(shù)碼。使用這些編碼，無線電天氣預(yù)報設(shè)備也可以接受具體的信號。

　　光盤有許多種。有一種叫做 CD-RW，是一種可反復(fù)重刻(重寫 )的光盤，其使用原理跟軟盤一樣。另一種是 CD-ROM，用這種光盤存儲數(shù)據(jù)的技術(shù)跟其他的光盤不同。這種光盤有一種染色層，光盤刻錄機可以將其涂黑或者留一些空白，這些黑點和空白點就是數(shù)碼。這里 CD-ROM就是讀存儲光盤的簡稱。這種存儲盤就如同可容納海量信息的超級軟盤，一張 CD-ROM可以容納相當于 500張軟盤存儲的信息，而且上面的信息可以永久保存。電腦游戲和其他程序也可視為 CD-ROM。

　　人們第一次從市面上購買到光盤是在 1982年，到現(xiàn)在為止這些光盤仍在使用中并且據(jù)說效果都還不錯。目前人們使用的光盤據(jù)說壽命可達 70～200年不等。當然，有一點你可以肯定的是，只要你足夠愛惜，你的光盤還可以用得更久。

　　科學是處在不斷發(fā)展中的，或許用不了很多年，一種全新的音樂存儲形式會為公眾所熟識。與此同時，毫無疑問，你將能繼續(xù)用光盤欣賞你最喜歡的音樂，并且能繼續(xù)用 CD-ROM玩你最喜歡的電腦游戲。

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