He found the sea on an old map.

I love swimming at the seashore.

I often go to the sea on weekends.

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 an aggressive man in relationships, actively pursuing love.

He is interested in radio wave research.

He is a herbivore man, not interested in marriage or dating.

The Japanese imperial family line is said to have the longest history in the world.

My nervous system is affected by stress.