Turn the visibility OFF for the "background" and "top" layers.

关闭“背景图层”和“顶部图层”的可视性。

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Turn the visibility ON for the white "background" layer.

打开白色“背景图层”的可见性。

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Turn the visibility ON for the white "background" layer.

打开白色“背景图层”的可见性。

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