It's difficult to understand the essence of his words.

He read the book about that topic and gained new knowledge.

My child really likes this picture book.

The main shop of this restaurant is in Tokyo.

His behavior became a good model for us.

He is a fool, acting without thinking.

This train is running on the main line.

When I first met her, I introduced myself saying, 'I am Japanese.'

He is a Japanophile, holding deep respect for Japanese culture.

That person is my friend.