A cooling device utilizing the principle of radiative cooling has been developed.

His behavior is a typical example of narcissism.

He is studying hard every day.

He mastered the technique of grafting grapevines.

She had a beautiful headdress on her head.

He couldn't hide his remorse for the failure.

If you rephrase that complex theory in simpler terms, it's just common sense.

He daringly accepted the challenge.

I gathered the stalks of millet and used them as livestock feed.

His thought is deep.