Tomorrow, I will go to the mountain on a school excursion.

I think he should be treated preferentially.

In the train, the priority seat is for the elderly and pregnant women.

It's difficult to decide the priority of work.

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.