单元测试不处理数据库、文件系统或任何可能延长测试运行时间的内容；因而，从第一天就可以编写单元测试。

Unit tests don't deal with databases, file systems, or anything else that would tend to make tests run longer; consequently, unit tests can be written from day one.

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由于等式中的一半是静态的，并且只有当一个单元被升级或替换时结果才会改变，因此处理器繁忙时间所占百分比可以很好地指示当前被使用的资源。

Because half of this equation was static and only changed when a unit was upgraded or swapped out, the processor busy number was a good indication of the resources being used.

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由于计算所需要的单元数减少，处理该问题所需要的时间也明显减少。

Due to the sharp reduction of the number of the element, the time needed for processing this problem is much less.

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