The treatment of some special line segments on body surface is studied by analyzing the validity of joint surface boundary. The forming process and drawing principle of aggregate are stated.
通过分析贴合面边界的有效性，研究形体表面某些特殊线段的处理，阐迷了集合体的构形过程及画图的原则。
2
Mindfulness should be fixed upon the theme selected, be it part of the body or any other aggregate. Do not be distracted, thus revealing fickleness and fluctuation.