In this museum, the entrance fee varies according to three age categories: adults, middle-aged, and children.

Kainaka is my best friend.

He gets excited about creampie in adult videos.

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

Cultural exchange between China and Korea is very important.

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.