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.

Where are you going?

He is very happy inside.

He will succeed soon.

The interior of this room is very beautiful.

He went to try out his new air gun.

He can't read the room, so he caused trouble for everyone at the party.

This factory uses compressed air to operate the machines.

He is always good at reading the atmosphere.