Ostrich is a Bird (definitely it is!) and hence it inherits the Bird class.

Ostrich(鸵鸟)是一种鸟(显然是)，并从Bird类继承。

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Now, if a Bird class (say, Ostrich) implements this interface, it has to implement the Fly() behaviour unnecessarily (Ostrich doesn't fly).

现在如果一个Bird类(如Ostrich)实现了这个接口，那么它需要实现不必要的Fly()行为(Ostrich不会飞)。

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Matilda is the leader of the anger management class on bird Island. She is a former angry bird herself, but has since learned the error of her ways.

大白鸟玛蒂尔达是愤怒管理的高手。她之前是一只脾气暴躁的小鸟，但是她现在已经改变了她错误的处事方式了。

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Without leaving the estate, you can also join a bird-watching group, embark on a nature trail safari or take a photography class.

FORBES: Magazine Article