Polyarchy refers to a political system where many people share power.

The era of the Five Good Emperors is considered the golden age of the Roman Empire.

Former Imperial Universities are some of the most traditional universities in Japan.

He deeply believes in the principles of socialism.

He is a perfectionist, and his approach to work is very strict.

Capitalism is a form of economy characterized by private property and the pursuit of corporate profits.

He is acting based on humanitarianism.

He always has an optimistic way of thinking.

He always takes a pessimistic view.

He deeply believes in the principles of communism.