同时接口也支持创建用户属性和多个类的公用方法；还有如人们所期待的那样一个类实现一个接口。

Distance;. And interface is also supported for creating member properties and methods that may be common to more than one class; a class implements an interface just as you'd expect.

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此外，消费者更加关注的外观和用户自己的家公用事业系统的接口。

Also, consumers are paying more attention to the physical appearance and user-interface of their home utility systems.

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