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假如您要起草一份环境污染的报告,需要核对21卷百科全书里与树有关的每一条参考条目,这项研究工作肯定要花去您几天时间,到图书馆去浏览每一卷著作,兴致索然地抄录有关的资料。现在,情况大不一样了,您只需坐在一台个人计算机前,随手插入一个4.7英寸的光学磁盘——CD-ROM(紧密磁盘只读存储器的英文缩写),然后用打字机打出“树”这个字,计算机就会对CD只读存储器扫描。这时,屏幕上几乎立刻会显示您在那套21卷、3.3万个词条的百科全书中常常要检索的字,以及CD只读存储器中存储的900万
If you are going to draft a report on environmental pollution and need to check every reference item related to the tree in the encyclopedia 21, this research work will certainly take a few days to go to the library to browse each volume, Interestingly copied the relevant information. Now, the situation is quite different, you just sit in front of a personal computer, readily insert a 4.7-inch optical disk - CD-ROM (Compact Disc Read Only Memory English abbreviation), and then use a typewriter to play “tree” This word, the computer will CD read-only memory scan. At this moment, the words you often search for in the encyclopedia of 21 volumes, 33,000 entries, and the 9 million stored in CD-ROM are displayed almost immediately