There is some CPU overhead in performing the dictionary translation, however there is also an improvement in disk IO efficiency as more data can be retrieved per IO unit.
在执行字典翻译时有一些CPU开销，但是在磁盘IO效率上也有一个提高，在每个IO单元更多数据可被检索。
When we write unit tests we should strive for code that is free of side effects, and IO certainly falls under this category.
当我们编写单元测试时，我们应该尽量编写没有副作用的代码，IO当然也属于这一类。
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