He was struggling to perform external rotation of the shoulder.

When I looked into her eyes, the phrase 'the eyes are the window to the soul' came to mind.

This house is warm even in winter because it has double-pane windows.

We should always remember the power of Kannon in difficult times.

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.