素描是美术学习当中非常重要的一部分，是西式美术学习的基础，也是美术学习中最先接触的一个内容。
Sketch is a very important part of art learning. It is the foundation of Western art learning and the first contact in art learning.
素描都是单色的画卷，通过线条的疏密深浅，来表现完全不同的光影变化，还有空间立体结构。
The sketches are all monochrome paintings, showing the completely different light and shadow changes through the dense and shallow lines of the lines, as well as the spatial three-dimensional structure.
素描用不同的方式可以分成不同的种类，一般会根据素描的内容来分成素描几何体、素描静物、素描头像、素描胸像、素描半身像这几个种类。
Sketch can be divided into different types in different ways. Generally, it is divided into sketch geometry, sketch still life, sketch avatar, sketch bust, sketch bust according to the content of the sketch.
这种分类方式也是学习素描的一个过程，最开始学习素描就是先画简单的几何图形，来练习线条基础，还有观察塑造的能力。
This classification is also a process of learning to draw. The first step in learning sketching is to draw simple geometric figures to practice the basics of lines and to observe the ability to shape.
