Phosphorous acid plays an important role in chemical reactions.

Sulfurous acid is often used for food preservation.

Nitrous acid plays an important role in chemical reactions.

I was able to complete this project because of your help. Thank you.

It is said that bandits used to live in that mountain long ago.

We reached the summit of the mountain.

This electrical equipment requires three-phase power.

In my house, there is a woman who is good at cooking, she is a 'sanpi'.

This information diffused quickly.

Please scatter this information.