每日背誦第一期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.
計算機病毒首先在80年代中期被創(chuàng)造出來，造成不同程度的影響。有些使文件被刪除，或使屏幕上的字看起來往下掉。其它的則在電腦一開機就顯示特定的信息。
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