He is an expert in analytical mechanics and deeply understands its theory.

We shared the progress of the project in a video conference.

I look forward to going to the sea for a swim with my family during the summer vacation.

We went to the swimming beach with our family during the summer vacation.

Kujō Yoshitsune, the former Prime Minister and Regent of the Go-Kyogoku, played an important role in Japanese history.

He is suffering from post-traumatic stress disorder from the war.

The rectus capitis posterior major muscle is a part of the neck muscles, and it helps in the action of pulling the head backwards.

The rectus capitis posterior minor muscle is a part of the neck muscles, and it helps tilt the head backwards.

He had a throat problem, and it was found that his posterior cricoarytenoid muscle was not functioning properly.

My brother is a famous biologist.