However, there is now some burden on the caller in that they need to determine at run - time whether an object implements a particular extension interface.
然而，这样对于调用者产生了额外的负担，他们还要判断对象在运行时是否实现了扩展的接口。
However, after that, the application exposes an extension interface in a different, higher-level language to make it easy and painless to enhance and customize the interface's behavior.
不过，该应用程序随后会在不同的高级语言中公开扩展接口，以便方便简单地对该接口的行为进行增强和自定义。
However, after that, the application exposes an extension interface in a different, higher-level language to make it easy and painless to enhance and customize the interface's behavior.
不过，该应用程序随后会在不同的高级语言中公开扩展接口，以便方便简单地对该接口的行为进行增强和自定义。
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