I like memorizing the Hyakunin Isshu.

It's difficult to memorize the Hyakunin Isshu.

He is studying the history of African Americans.

They have a variety of opinions, making it difficult to agree.

He is recognized as the top person in that field.

He is majoring in electrical engineering.

He is majoring in civil engineering.

I am very interested in natural science.

Statistical mechanics is a branch of physics that provides a theoretical framework for understanding macroscopic phenomena from a microscopic perspective.

He is an expert in analytical mechanics and deeply understands its theory.