考虑这样一个情形：企业中的每个操作系统实例都需要安装特殊的杀毒软件。
Consider a case in which every operating system instance in an enterprise is required to have special anti-virus software installed.
另一方面，杀毒软件售价普遍偏高，多数企业用户为此支付了较高费用。
On the other hand, antivirus software prices are rather high and the majority of business users pay a higher cost.
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