This product is popular nationwide.

Please infer the content of the blank from the context before and after the sentence.

It's my role to manage the entirety of this project.

This town once reached its height of prosperity.

His talent is something extremely uncommon.

He proposed a complete reform.

An abnormality was observed in his anterior chamber.

This perfume contains ambergris, an expensive ingredient.

I have been to North Jeolla.

Natural language understanding is an important field of artificial intelligence.