The prepositional case plays an important role in English grammar.

The anterior scalene muscle is part of the neck muscles and plays a role in assisting with respiration.

He is known as an expert in subcritical nuclear experiments.

Kujō Yoshitsune, the former Prime Minister and Regent of the Go-Kyogoku, played an important role in Japanese history.

Hoshoji Nyudo Zen Seki Hakutaijo Daijin is a courtesy title of Fujiwara no Tadamichi.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.