He is undergoing rigorous training every day to master ancient weapon techniques.

He spends a lot of time on public works.

Life in the Stone Age was greatly different from today.

He is working at a school as a student teacher.

My younger brother is attending a middle education school.

This miso is something my grandmother made.

He suffers from adrenal cortex insufficiency.

Angiosperms make up the majority of plant species on Earth.

Understanding geometric sequences is important for understanding mathematics.

He resorted to escapism to escape from reality.