He got the opportunity to show his skills in the new project.

We participated in an arm wrestling tournament yesterday.

He became my arm pillow.

He fell asleep using my arm as a pillow.

He got a tattoo on his forearm.

He likes to take a walk in the park at dusk.

The Calopteryx cornelia is a species endemic to Japan, and it has beautiful wings.

His advice was like pushing against a curtain to her, having no effect.

He is doing special exercises to strengthen his coracobrachialis muscle.

The multi-armed bandit problem is a part of probability theory, providing an algorithm for making optimal choices.