美国丹佛“ProCD”公司招聘450名北京大学学生将从美国250家电话公司得到的约5000本电话簿输入计算机。当然,这项工作由扫描器——能阅读并能存入计算机存储器的仪器来完成。但是扫描器很难胜任印刷在劣等发黄电话簿上的小字,大学生们每周输入450万个电话号码。该公司出版了5张光盘,这些光盘包含有美国8300万电话用户的全部电话号码和家庭地址。在美国,电话公司间讯处每年回答 About 450 Peking University students are recruited by Denver “ProCD ” into the computer from some 5,000 phone books from 250 U.S. telephone companies. Of course, this is done by scanners - instruments that can be read and stored in computer memory. However, it is not easy for scanners to print the small print printed on the inferior yellowed phone book, and college students enter 4.5 million weekly phone numbers. The company has published five CD-ROMs containing the full telephone numbers and home addresses of 83 million US phone users. In the United States, the telephone company’s Office replies annually