所以，在暗部的边缘处理应该“柔和”。
So in the shadow side of an object, the edges tend to be a little softer.
暗部的纹理完全看不清，同样在一些亮部区域纹理也不显著，比如前额和左侧边缘。
It's also not terribly prominent in the fully lit areas of lighter halftone, such as the forehead and the left hand edge of the form.
照片展示了直射阳光下的球体。它从亮部到暗部的调子泾渭分明。这个就是素描关系。
The photograph above shows a sphere in direct sunlight. It has a distinct set of tonal steps from light to shadow, known as modeling factors.
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