To the theory study, we have a principle of Necessity and Enough for Practical Use.
对于理论学习，我们以够用为原则。
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。
The second part explains the necessity of the credit archives and management principle.
第二部分阐述了信用档案的必要性和管理原则。
The second part explains the necessity of the credit archives and management principle.
第二部分阐述了信用档案的必要性和管理原则。
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