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

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

He engaged in an extravehicular activity from the spaceship.

He is undergoing training for extravehicular activity.

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

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

After we had a big fight, we became a stronger relationship, just like the proverb 'after the rain, the ground hardens'.

The Fudo Myoo, also known as Acala, is known as a guardian deity in Buddhism.

Surface meteorology is a part of meteorology that studies the interaction between the surface and the atmosphere.

The scenery of the Nordic countries is very beautiful.