可以从标尺“拖出”这些线，作为在工作区上放置组件时的垂直或水平参考线。
These can be "dragged out" of rulers, providing a vertical or horizontal line to reference as you place components on the workspace.
用顶边下来450 px处画一条水平参考线，我们将要用它给顶部添加阴影作为参考。
Draw a horizontal guide around 450px from the top border, we will use it as a reference guide to add a shade on top of the page.
“水平居中”可在边距参考线中心垂直对齐每个对象的中心。
Align center to line up the center of each object vertically in the center of the margin guides.
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