1.The Principate system, more than 500 years has laid a solid foundation for the imperial system.
元首制度的建立,奠定了500余年帝制的坚实基础。
2.However, from the Republican point of view of the constitutional power of the Principate, there are rare books;
但是,单从共和宪政的角度分析元首权力的著作并不多见;