Scientists are warning that this substance has carcinogenicity.

This area is still undeveloped.

This area is still undeveloped and rich in nature.

This newly released smartphone is equipped with the latest technology.

Scientists are warning that this substance is carcinogenic.

He is struggling with the spelling pronunciation of English.

Learning about the nasal sound rule in Japanese is very important for understanding pronunciation.

We are here to solve that problem.

He taught me Japanese.

I couldn't understand his explanation because it was vague.