a separation of powers权力分立;分权制
reasonable separation of powers合理分权
the separation of powers对权力分立;权力分立
horizontal separation of powers横向分权
separation of two powers两权分离
Separation of powers principle权力分立
Social Separation of Powers社会分权
administrative separation of powers行政分权
For example, the separation of powers, natural law theory, freedom and so on.
例如三权分立、自然法理论、自由等等。
参考来源 - 论检察机关对审判的监督（研究生论文）The constitution of the United States signed in 1787 established the basic military principles: centralization, civil official control the military, separation of powers. The years before American Civil War is precisely the regularization time of the U. S. army.
1787年的美国宪法确立了重要的军事原则:中央集权、文官治军和三权分立。
参考来源 - 约翰·洛克政治理论对美国宪政的形成产生的影响