Working directory is a directory used as a reference point within a directory tree in a computer operating system.

工作目录是指在计算机操作系统中，在目录树内用参考点的一种目录。

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Though Surface is clearly a tablet device, Sinofsky pointed out that the process of developing Windows 8 (on which Surface's Windows RT operating system is based) started in the summer of 2009, when there was no Apple iPad as a reference point (though it remains unclear if Microsoft began working on its tablet at that time).

CNN: Microsoft Surface tablet goes on sale for $499