Sketch requires the use of minimalist language to describe the characteristics of the scene and reflect the author's feelings. When drawing a landscape by line drawing, the author is required to draw thick lines with simple strokes to form a vivid picture. For example, Du Fu's "Shihao Guan", "At dusk, officials arrest people at night", did not render and spread, but used vivid pens to enlighten them. It is easy to judge that it is a line drawing technique.
However, the technique of line drawing is not simple description or lyricism, but uses the simplest and most economical words to outline the mental outlook of the characters with thick lines. The screenwriter is required to accurately grasp the most important personality characteristics of the characters, not to render or lay out, but to touch them with vivid pens.