按住空格键或鼠标中键。

Hold down spacebar or the middle mouse button.

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或者使用空格键或左右箭头移动高亮显示的选项，并按回车键。

Or you can use the space bar or the left and right arrow keys to move the highlight, and then press the return key.

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通过按tab键将焦点移动到该按钮上，然后按空格键或Enter选择该按钮。

Move the focus to the button by pressing the TAB key, and then choose the button by pressing the SPACEBAR or ENTER.

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