看一看你的手指，淡化主体部分，只留意轮廓线，你就可以“看见”各种线形成了你的手指的形状及纹路。
You can start to see the many lines that make up the shape of the finger. The outlines, the wrinkles, and the shadows can all be expressed with lines.
建筑物作为城市区域的主体单元，其轮廓的矢量信息在城市研究中有着重要的应用价值。
Building is principle part of city zone. Vector information of building profile holds vital application value in city research.
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