为了简便起见，在此练习中可以这样做，但是对于类来说，最佳实践是不要知道谁在拦截它。
You will do this for simplicity in this exercise, but it is often a best practice for a class not to be aware of who is intercepting it.
把作业，做练习当作是语文实践。
They just think that homework and exercises are the practice of Chinese studying.
把作业，做练习当作是语文实践。
They just think that homework and exercises are the practice of Chinese studying.
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