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

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

This sentence contains kanji not approved for regular use.

This sentence contains non-Jōyō kanji.

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

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

The external urethral sphincter is an important muscle for controlling the excretion of urine.

I went to see the beautiful scenery of Sotogahama.

He is doing special exercises to strengthen his tensor fasciae latae.

He trains his biceps at the gym every day.