It's difficult to understand his explanation.

He is deeply influenced by the teachings of Buddhism.

It's difficult to understand his explanation.

He deeply believes in Buddhism.

His eyes are a deep blue.

The cause of his lateness was the train delay.

The cause of his lateness was the train delay.

Mr. In deeply understands the teachings of Buddhism.

Smoking is considered a cause of carcinogenesis.

This lake is very deep.