选择它得到一个模糊画笔，你可以用来隐藏网页上的敏感信息。

Select it to get a blur brush that you can use to hide sensitive information on webpages.

youdao

但是因为我们使用了不同大小的画笔，因此背景和极端的前景就都是模糊的——就象相机产生的图像一样。

But because we have been using various sized brushes, the objects in the background and extreme foreground are blurred out-just like the image produced by a camera.

youdao

玩耍的画笔工具自定义集中模式画的部分图像，应该出现在焦点和模糊。

Play around with the Brush tool in Custom focus mode to paint over those parts of the image that should appear in focus and blur out the rest.

youdao