点击确认，出现选取后进入快速蒙版模式。
Hit OK, and after the selection was made enter Quick Mask mode.
退出快速蒙版模式，我们得到了影子的选区。
Exit Quick Mask mode and we have the selection of the shadow.
选择“快速蒙版模式”，只要点击在下图中被圈为红色的两个按钮的右边。
To go into 'quick mask mode', simply click on the right of the two buttons that are circled in red in the image below.
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