He drew a small circle on the notebook.

I am planning to go to Inner Mongolia, an autonomous region of China, next week.

I have been to Outer Mongolia.

I have been to Chicago.

The Paleogene period was a very important time in the history of the Earth.

The theory of harmonic oscillators is a fundamental concept in physics.

He is a perfectionist, so he is very strict about his work.

He played a perfect fifth scale on the piano.

Mieko is my best friend.

This 'enkanabachi' is a very rare type of bee.