In addition, a wide variety of third-party class libraries are available on the Internet.

此外，在Internet上还提供了多种第三方类库。

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An interface implementation may be added to any existing third party class.

可以将一个接口的实现，增加到任何已经存在的第三方的类中。

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A third party class must be rewritten to extend only from the abstract class.

第三方的类必须被重写，只能从抽象类继承。

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A third party class must be rewritten to extend only from the abstract class.

第三方的类必须被重写，只能从抽象类继承。

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