He is undergoing training for extravehicular activity.

He engaged in an extravehicular activity from the spaceship.

He is a foreigner, but he can speak Japanese fluently.

I have been to Outer Mongolia.

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.

He started exercises to strengthen his abductors.