Mount Fuji is the highest mountain in Japan.

He loves mountain climbing.

Mountainous areas are ideal for hiking.

I climbed three mountains.

Mr. Yama is my best friend.

When spring comes, I go to the mountains to look for bamboo shoots.

He read quite a lot of books.

He is an expert in embryology, studying the developmental processes of many kinds of organisms.

The process of embryogenesis is very complex, with continuous cell division and differentiation.

He is always joking around during class.