In today's world, we rely on computers as never before. They are used for everything from ordering a pizza to running hospitals and military defense systems. Banking and credit card information is stored and accessed by computers. So what happens when a computer gets infected with a virus? One effect is that people's access to their e-mail accounts is cut off. A more serious possible consequence is that billions of dollars could be lost.

在当今世界，我们前所未有地依赖电脑。从订购比萨饼到管理医院及军事防御系统，计算机的使用范围广及各个层面。银行业务及信用卡的资料都要靠计算机储存和支取。假如计算机染上病毒会怎样呢？一个影响是电子邮件帐户的通路被切断，另一个更严重的后果则是数十亿的美元有可能丢失。