If you have the Brush tool selected, hold down Opt key will quickly activate the Eyedropper tool.
如果你已经选择了笔刷工具，按住opt键可以快速启动吸管工具。
In the current mobile tool, if you do not select Auto-select the layer, as long as you hold down the CTRL key, you can also free choice from different layer of image content.
在当前为移动工具时，即使不选择自动选择图层，只要按住Ctrl键，同样可以自由的选择分属不同层的图像内容。
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