He is an expert in chemistry.

He received the letter challenging him to a duel and began preparing for the duel.

Gender roles are an important element in defining individual behavior in society.

His role is to fulfill his responsibilities as a leader.

Her smile was shining brightly.

His name is Sansan.

I like to eat fruit between meals.

My younger sister says she wants to become a pediatrician.

He is studying in the study room.

The opening performance of this theater company was a great success.