每日背诵第一期49
The first computer viruses were created in the mid '80s and had varying effects. Some caused files to be deleted, or made the letters on the screen appear to fall off. Others displayed a specific message once the computer was turned on.
计算机病毒首先在80年代中期被创造出来，造成不同程度的影响。有些使文件被删除，或使屏幕上的字看起来往下掉。其它的则在电脑一开机就显示特定的信息。
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