Master skills of freehand drawing.

掌握徒手绘图的技巧。

Koos Eissen is an associate professor at the Delft University of Technology and teaches freehand drawing classes at the Faculty of Industrial Design Engineering.

库斯·埃森是代夫特理工大学的副教授，主讲工业设计工程的徒手绘图能力课程。

Courses in mechanical drawing and architectural drawing are not necessary and, in fact, may be less useful than general academic subjects and freehand drawing classes.

机械制图和建筑绘图课程是没有必要的，事实上，可能会比一般学科和徒手画类的有用。

Understand freehand sketching methods and axonometric drawing methods of sections.

了解徒手作剖视草图和剖视轴测图技能。