As with abstract classes, you can define any number of method signatures.

对于抽象类，可以定义任意数目的方法签名。

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Abstract classes are those with at least one method without code.

抽象类是那些至少有一个方法没有代码。

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Abstract classes are those with at least one method without code.

抽象类是那些至少有一个方法没有代码。

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