The inner layers of the Earth are extremely hot, and their condition is not yet fully understood.

He headed to the palace to tell the emperor an important report.

We are looking for new partnerships to strengthen our business contact.

My best friend is a twin sister.

This sentence shows the aspect of completion.

Mr. Aso is my best friend.

He was considering a petition to the emperor.

He petitioned the emperor.

This phase diagram shows the state of the substance.

I am planning to go to Seoul next week.