Infix notation is a common way of writing expressions, while prefix and postfix notations are primarily used in computer science.
中缀表示法是书写表达式的常见方式，而前缀和后缀表示法主要用于计算机科学领域。
Writing simulated program is a way to study web caching protocols in common use and server log files are the original data to test the simulated program.
编写模拟程序是进行网络缓存协议研究的常用手段，而服务器日志是对模拟程序进行测试的原始数据。
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