你可以看到，我们有一个按钮，调用一个函数。

As you can see, we have a button that calls a function.

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Google会提供一个有说服力的理由让我们按下+ 1按钮吗？或者Twitter和Facebook的“赞”对你来说已经足够了？

Will Google offer a compelling reason to click that + 1 button or is Tweeting and Liking enough for you?

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把这一概念移植到视觉设计领域：当我们在网页上看到一个有3D样式的按钮时，我们立马就能明白这是一个可以用鼠标来“按”的东西。

This concept transfers to the virtual environment: when we see a 3D-shaped button on a web page, we understand that we are supposed to “push” it with a mouse-click.

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