Classic examples are the vertical edges of walls running in alignment with the sides of television screens and the edges of ceilings being parallel to those of table tops and cabinets.
常见的例子有：墙壁的垂直边和电视屏幕相互平行，同样天花板则与桌子和衣柜的上面平行。
Classic examples are the vertical edges of walls running in alignment with the sides of television screens and the edges of ceilings being parallel to those of table tops and cabinets.
常见的例子有：墙壁的垂直边和电视屏幕相互平行，同样天花板则与桌子和衣柜的上面平行。
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