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.

youdao

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.

youdao