现在你要为你选择的形状设置混合选项。

You will now have to set the Blending Options for the shape you selected.

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postMixInProperties：这个方法会在所有小部件参数均被设置（混合入）为小部件实例属性后调用。

postMixInProperties: This method is called after all the widget parameters have been set (mixed in) as widget instance properties.

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现在将水彩图层的透明度减少到70%左右，将覆盖模式设置为混合模式。

Now decrease the opacity of the watercolor layer to about 70% and set its blend mode to Overlay.

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