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.

I am planning to go to Gangwon in Korea next week.

I ended up cohabiting with him.

My new sneakers are very comfortable.

He succeeded in developing a charcoal-powered vehicle.