shading

详细解释:n. 留下阴影, 描影法, 明暗法, 细微变化
【计】 底纹
【化】 遮阳
【经】 减让

英语解释：

名词 shading:

graded markings that indicate light or shaded areas in a drawing or paintinga gradation involving small or imperceptible differences between grades同义词：blending