比起根据字典上的注意读出每个单词，模仿另一个人的说话要容易得多！
It's much easier to imitate another speaker than it is to sound out each word according to phonetics in a dictionary!
既然模仿内置功能，为何不根据这些已有的方法建立模型呢？
We're working on imitating built-in functionality, so why not model our methods on those that already exist?
注：根据模仿对象的创造者所说，它应该在其 validate() 方法内部执行自己的所有验证。
Note: According to its inventors, a mock object is supposed to perform all of its own validation inside its validate() method.
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