Part six: the method and channel of drawing into the proportional principle.
第六部分：引入比例原则的方式与途径。
2
Part four: the analysis to the necessity of drawing into the proportional principle.
第四部分：我国引入比例原则的必要性分析。
3
The model is a representative object that imitates the archetype and copied by following some proportional relations, it has part or whole features of the archetype.