He is trying to hide his embarrassing past.

He recognizes the importance of oral history.

He interprets world events from a historicism perspective.

His words always resonate in my heart.

During the Yuan dynasty, Chinese culture developed greatly.

Archi-humans are our ancestors.

This month's sales decreased by 20% compared to last month.

This phenomenon remains unexplained to scientists.

The population is decreasing.

A nuclear reactor is planned to be built in this area.