• 1. 颜色等级
  2...颜色等级 gradations...256 levels for Red, Green, Blue
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• 2. 色彩的层次感
  绘画注重光线的明暗对比（chiaroscuro）、色彩的层次感（gradations）以及几何透视（geometric or parallel perspective）手法的运用。...
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1. It is hard to understand all the minute gradations of their bureaucracy 
   很难弄清楚他们那套官僚体制全部细微的等级分别
2. (of pictures or drawings) drawn or painted with degrees or gradations of shadow. 
   （指图画或者素描）描出或者画出阴影的程度或者层次。
3. A uniform-bore glass tube with fine gradations and a stopcock at the bottom, used especially in laboratory procedures for accurate fluid dispensing and measurement. 
   滴定管一种统一口径的玻璃试管，有精确的刻度和下端有一个停止旋塞，特别用于实验室中对精确液流的分配和测量程序
4. The lines or other marks used to fill in outlines of a sketch, an engraving, or a painting to represent gradations of color or darkness. 
   影线用于填充素描、雕刻或油画的线条或其它痕迹以展示颜色或暗度的梯度
5. A picture in which the gradations of light are obtained by the relative darkness and density of tiny dots produced by photographing the subject through a fine screen. 
   照相（网目）铜版一种照片，通过一个精制屏幕拍摄一个物体，由此产生光点的不同亮度和密度，从而形成光的明暗变化

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