Chemotransmitters play an important role in the transmission of information between nerve cells.

No chemical flavoring is used in this ramen at all.

My company specializes in the manufacture of fine chemicals.

The concept of chemical equivalent is essential for understanding chemical reactions.

If you add two tens, it becomes twenty.

The marten is a small mammal that lives in the forests of Japan.

This chemical reacts when heat is added.

This chemical reaction is very dangerous.

Where is my pen?

The Tenwa era was a time when Japanese culture developed greatly.