——不管你使用一栏还是三栏，多么多的链接，你页面的视觉感将会极大地影响到它的可读性。
Whether you pick one column or three, a lot of scrolling or none, decisions on your pages' visual hierarchy will directly affect readability.
我们将说明如何创建自定义主题、安装主题以及自定义不由主题控制的视觉外观，如页面和小部件标题。
The instructions describe how to create a custom theme, install the theme, and customize aspects of the visual appearance that are not controlled by the theme, such as the page and widget titles.
if rame通常用作视觉元素，在浏览器页面中显示为带边界的UI组件。
An iframe is typically used as a visual element displayed in a browser page as a bordered UI component.
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