If the movement of the eyeball muscles becomes impaired, your vision becomes blurry.

As I was walking down Tenkajiku, there were many shops lined up.

He is suffering from muscle pain in his gemellus muscle.

He is doing special exercises to strengthen his intercostal muscles.

He is doing special exercises to strengthen his mentalis muscle.

He is doing special exercises to strengthen his caninus muscle.

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.