第三个按钮比较长因为它包含更多的内容。
The third button is larger because it contains more content.
释放-第三个按钮不会重置按钮的背景色，除非在该按钮上按下和释放鼠标。
Release - the third button does not reset the background color of the buttons until the mouse is pressed and released in the button.
前面两个按钮将一个合适尺寸作为默认宽度，第三个按钮将会比较大因为它有一个较长的标签。
The first two buttons will be sized at a suitable default width and the third button will be larger because it has a longer label.
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