A button object represents a clickable button, which raises an event, so you can perform an action upon a click.

Button对象表示一个可点击按钮，它会引发一个事件，所以可以在点击时执行某个动作。

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Similarly, the second line connects the cb_button_click function to the clicked signal on the button object.

类似地，第二行把cb _ button_click函数连接到button对象的clicked信号。

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You create a listener object and register it with a Button widget, for example.

举例，当你创建了一个listener对象，把它注册到一个按钮上。

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When you search for certain keywords like durian, campsite, moth balls, grandpa's hat or maple syrup, a description of that object's odor and a big blue "Smell" button appear alongside the search results.

CNN: Heather Kelly,

Total Immersion specialises in so-called web mashups, where an online user sees a video reflection of themselves coupled with a 3D object that they can control, such as camera that responds accurately to button presses, or a pair of glasses that lets the user switch the frame or colour scheme.

BBC: Augmented reality goes beyond gimmicks for business