He used an obimakura to adjust the obi of his kimono.

He has a black belt in karate.

This obidome is a keepsake from my grandmother.

He attended the ceremony of wearing an official order or decoration.

She bought new nightwear.

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

In this situation, the proverb 'it is best to submit to circumstances' applies.

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.