The external shell of a crab is very hard.

He is strengthening his muscles by doing shoulder abduction exercises.

The rear-facing camera is broken, so I need to buy a new smartphone.

He was fishing outside of the boat.

He was told by the doctor that supination of his wrist is difficult.

We are planning to travel outside of the prefecture next week.

This shell's outer lip has a very beautiful pattern.

He was struggling to perform external rotation of the shoulder.

He was always envious of others' success, saying that the grass is always greener on the other side.

He is undergoing training for extravehicular activity.