He is researching on the pathogenesis and treatment of early-onset diabetes.

This area is rich in bedded cupriferous iron sulphide deposits.

He is fighting against illness.

I spilled the powder in the kitchen.

He is good at playing the guqin.

The National Research and Development Agency plays a crucial role in advancing science and technology.

Fumiko wrote him a letter.

We decided to explore the cave.

He stood up against the enemy.

The Democratic People's Republic of Korea is located in Asia.