Draw a vertical line down the center of your notebook paper.

在笔记本的一页的中间划一条竖线。

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When a user selects an object, a vertical line extends from the center of the object to the grid.

当用户选择一个对象后，从对象的中心有一条垂直线扩展到网格。

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Make sure no other buttons are selected so that the options you select for the line affect only the center vertical line.

请确保未选中其他按钮，以便所选的线条选项仅影响垂直居中线条。

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