当你鼠标滑过任务栏上的图标是就会显示打开窗口的缩略图预览。
The taskbar shows thumbnail previews of opened Windows when you hover the mouse over the program icon. By default, it takes a little time for the preview to appear.
Windows 7在一些方面超过了Mac OS，例如更好地从任务栏进行预览和导航，更便捷地组织打开窗口和摸屏功能。
Windows 7 beats the Mac OS in some areas, such as better previews and navigation right from the taskbar, easier organization of open Windows and touch-screen capabilities.
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