His new car is a Mustang.

An imaginary unit is an important concept in mathematics.

An astronomical unit represents the average distance from the Earth to the Sun.

I always use binchotan charcoal when I grill meat.

He was painting a picture using red lead.

This drink contains carbonic acid.

This simple forest is very important from the perspective of biodiversity.

This factory has significantly reduced its carbon dioxide emissions.

Monotremata is a part of mammals, and it has different characteristics from other animals such as birds and reptiles.

My younger sister is attending a junior college.