求翻译：设计素描练习，除了表现对象的结构、体积、明暗、色调之外，还要表现出物体的质感。它是表现设计形象的一个重要因素，所以要求锻炼我们掌握深入刻划物体质感的技能。是什么意思？

Design drawing practice, in addition to the performance of object structure, volume, brightness, hue, should also show the texture of the object. It is designed to image the performance is an important factor, it requires training to master the in-depth characterization of the object texture of our

In addition, performance object design sketching exercises the structure, size, brightness, color, it is also necessary to show the texture objects. It is the manifestation of the design image, so one of the important factors that we have built up an in-depth portrayal of texture objects skills.

Design sketch practice, besides performance object structure, volume, light and shade, tone, but also must display the object the sense of reality.It is displays the design image an important attribute, therefore the request exercises us to grasp the thorough scoring object sense of reality the skil

Design drawing exercises, in addition to objects outside the structure, size, shade, tint, but also to show the texture of an object. It is an important factor in performance design images, therefore exercise we hold in-depth description object texture skills.

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