He is studying the history of National Socialism.

Japan's gross national product is the third highest in the world.

Japan's net national product is an important indicator of the health of the economy.

He is a person of strong vanity who reads self-improvement books.

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

By regularly checking the key performance indicators, you can understand the performance of the company and devise improvement measures.

We should always remember the power of Kannon in difficult times.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.