He played the lead role in the middle of the play.

My father is good at Shogi.

Cultural exchange between China and Korea is very important.

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.