He is an expert in international relations.

In arid regions, there is little rain, making it difficult for plants to grow.

It's difficult to calculate the area of this hexagon.

He became neurasthenic due to long hours of work.

The styloglossus muscle plays a role in raising and pulling the tongue back.

He was immersed in music.

We need support services for Japanese people living abroad.

The character of 牽 is very charming.

He is doing a special exercise to strengthen his sternohyoid muscle.

The thyrohyoid muscle is one of the muscles that lift the larynx.