Roundworms are an important part of the soil and contribute greatly to the health and fertility of the soil.

He was hit hard in the solar plexus during the boxing match.

Let's calculate the area of this right-angled triangle.

I am majoring in econometrics at university.

We decided to explore the cave.

Atsushi is my classmate in junior high school.

Mr. Masuda swims in the pool every day.

She is good at making artificial flowers.

Alkynes play an important role in organic chemistry.

Alkenes play an important role in organic chemistry.