求翻译：2 绘画明暗色调时，应首先从物体的暗部开始，依次向灰部及亮部过渡，因为确定画面中物体色调的不同深浅层次同样也是一个比较的过程。是什么意思？

2 painting light and dark shades, they should first start from the dark object, followed by the Ministry and highlights to gray transition, because the color of objects in the screen to determine the different levels of depth is also a comparison process.

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When 2 drawing light and shade tone, should first from the object dark start, in turn to the ash department and the bright transition, because in the determination picture the object tone different depth level similarly also is a comparison process.

2 when painting and dark tones, should start from the object of the first dark, then transition to ashes and light, because the different depth levels determine objects tones in the picture is also a process of comparison.

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