He recognizes the importance of oral history.

He interprets world events from a historicism perspective.

The doctor examined his semen sample.

The volume ratio of this container is 1:2.

He is troubled by chronic headaches.

Sekibune is a type of boat that was used for military purposes historically.

His work has a unique worldview.

An international auxiliary language is a language used for communication beyond countries and cultures.

A special event was held to celebrate his 100th birthday anniversary.

The chemistry class is very difficult.