He is leading a hedonistic lifestyle.

He always tackles things with an optimistic spirit.

He is a true optimist, always believing in a bright future.

What does the constructor of this class do?

I have been to Luxemburg city in Iowa.

Kyoto is known as the ancient capital city.

This song expresses a joyful feeling.

The company fell into decline due to the economic crisis.

Deciduous forests clearly show the change of the four seasons.

Butyrate plays an important role in organic chemistry.