桥梁的内外侧轮廓线应顺滑清晰，无突变、明显折变或反复现象。

The contour line of the inner and outer of bridge shall be smooth and clear, without sudden break, obvious flection or recurrence.

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这是因为当你观察云层的时候，你会发现它是平滑的过渡和尖锐的明暗对比与清晰的明亮的轮廓线两种类型奇怪的混合。

It's because when you take a look at the cloud, you'll find out that its kind of a strange blend of smooth transitions in one hand and sharp contrasts with hard and bright Outlines on the other.

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摘要：在医学图像三维显示技术中，需要得到单象素级的清晰轮廓线。

Abstract: in 3d render technique of medical images, we need edges which are single pixel.

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