How to judge whether line drawing is used in poetry? What does sketch mean?

In literary creation, "line drawing", as a method of expression, refers to drawing vivid images with the most concise pen and ink without comparison. China's excellent classical novels "Water Margin" and "Romance of the Three Kingdoms" often use the method of drawing lines; In Lu Xun's works, there are also many examples of using line drawing techniques.

Sketch requires using minimalist language to describe the characteristics of the scenery and reflect the author's feelings.

Such as Ma Zhiyuan's "Tianjingsha Qiu Si":

Dead vines, old trees, faint crows,

Small bridges and flowing water,

The ancient road is westerly and thin. ``

The sun went down,

Heartbroken people are at the end of the world.

The author only used line drawing to arrange the scenery, but achieved the effect of eternal farewell. I believe that everyone who has seen it will have a picture of a wanderer in his mind. In this picture, the vine is dead, the tree is old and the crow is at dusk. Their emotions are bleak or bleak. At this time, it is natural to see people with small bridges and flowing water, and homesickness will spread from the bottom of my heart. Look up at the long ancient road in the distance, listen to the autumn wind whistling in your ear, and see what it feels like to get off the thin horse. Only heartbreak! This is a line drawing.