求翻译：在表现物体时，如果只用线描的形式把物体的高、宽、深三度空间的结构、体面、透视关系画出来，不涂明暗也能呈现出物体的体积感，使人们能够在视觉上认识它的形象。但是，这个物体的立体效果还很不充分。如果同时描绘出它体面变化的明暗色调关系，就能更充分地表现出它的立体空间。是什么意思？

In the performance of the object, if only in the form of line drawing objects with a high, wide, deep three-dimensional structure, decent, perspective relationship drawn, painted light and dark can not show a sense of the size of the object, so that people can visually the recognition of its image.

If only the performance object, the objects used in the form of line drawings, width, and deep-space structure of 3 degrees, decent, lens relations, not painted and shade can also show the volume of the object in the visual sense, so that people can understand its image. However, this object was not

When performance object, if only uses the line drawing the form the object high, wide, the deep three-dimensional space structure, the dignity, the perspective relations picture to come out, does not spread the light and shade also to be able to present the object the volume feeling, enables the peo

In performance object, if only with a line drawing object in the form of three dimensional structure of high, wide and deep, dignified, perspective drawing, not paint dark also takes on a sense of the volume of an object so that people can recognize it on the Visual image. However, the body of the s

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