He is really knowledgeable and always teaches us new information.

I am majoring in meteorology at university.

He is very interested in paleontology.

He is an expert in paleobotany, conducting research on plants from the dinosaur era.

He has a deep interest in paleozoology.

He is an expert in paleoecology, pouring his passion into studying past ecosystems.

He is writing a thesis on paleogeography.

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.

Katsuki is always angry.

He has expert knowledge.