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The essential component of a virus is a set of instructions which
計算機病毒的基本組成部分是這樣一組指令，
when executed ,spreads itself to other ,previously unaffected, programs or files.
當這組指令被執行時，它就會被傳播到本來沒受過影響的程序或文件上。
First , it copies itself into previously uninfected programs or files.
第一種作用是要把它自身拷貝到以前未受感染的程序或文件上。
Second (perhaps after a specific number of executions, or on a specific date) it executes whatever other instructions the virus author included in it.
第二種作用是（也許是在某特定的執行次數以后，或者在某個特定日期）執行病毒作者所隱含在其中的別的什么指令。
Depending on the motives of the virus author, these instructions can do anything at all.
根據病毒作者的動機，這些指令完全能做出任何事情。
including displaying a message ,erasing files or subtly altering stored data.
包括：顯示某種信息，抹去某些文件或微妙地改變存儲的數據。
In some cases ,a virus may contain no intentionally harmful or disruptive instructions at all.
在某些情況下，某種病毒可能一點沒有包含什么故意有害的或破壞性的指令。
Instead , it may cause damage by replicating itself and taking up scarce resources, such as disk space, CPU time ,or network connections.
而是通過自身的重復和占去某些值得的資源（如磁盤空間、CPU時間或網絡連接等）來造成破壞。
Let us now examine a particular sequence of events by which virus could enter an organization and spread within it .
現在讓我們來觀察一個特殊系列事件，通過這些事件，病毒進入一個機構并廣為傳播。
Suppose that the organization hires an outside person to come in and perform some work.
假設這個機構在外面雇傭了一個外來人員來完成這項工作。
Part of that person's work involves working on one of the organization's personal computers.
這項工作的一部分要在該機構的一臺個人計算機上操作。
The person brings in a few programs to aid in this work, such as a favorite text editor.
此人為了有助于工作的進行，帶來了一些程序，如一個適用的文本編輯程序。
Without the person having realized it ,the text editor may be infected with a virus.
在無人意識到的情況下，這個文本編輯程序可能會染上了一種病毒。
