Mr. Nakai is my best friend.

She is studying traditional Chinese medicine and is utilizing that knowledge.

Mail arrived while I was away from home.

He was promoted to lieutenant general yesterday.

The Mesoarchean eon is a part of Earth's history, which lasted from about 3 billion years ago to about 2.8 billion years ago.

Where does the Mesoproterozoic era fit in the history of the Earth?

He plays a very important role as the team's middle blocker.

I visited Zhongwei, a prefecture-level city in Ningxia, China.

We are living in the present.

He was the person inside that kigurumi costume.