国体的英文：
polity

Miss Su felt that Miss Pao's exposed body constituted an insult to the body politic of the Chinese nation
可是苏小姐觉得鲍小姐赤身露体，伤害及中国国体。

History and polities overlap and should be studied together.
历史和政治有一部分重叠，应该放在一起研究。

His alien philosophy found no roots in the American polity(New York Times)
他与众不同的哲学并非来源于美国的政治体制(纽约时报)

Only Congress holds the singular power to make policy decisions for the national polity.
只有国会拥有为国家政治做出政治决定的独特权力。