Coitus interruptus is one method of contraception, but it is not completely reliable.

This book explains in detail about the use of foreign words.

He is doing special exercises to strengthen his supinator.

The external intercostal muscle plays an important role in respiration.

He underwent surgery on his extraocular muscle.

I went to see the beautiful scenery of Sotogahama.

There are many introduced species of plants living in this park.

He started exercises to strengthen his abductors.

He is doing special exercises to strengthen his external obturator muscle.

The external anal sphincter plays a crucial role in helping us control defecation.