During periods of low stock prices, you should be cautious about investing.

Ayumi is my best friend.

He can speak Italian fluently.

Annam is the old name of Vietnam.

The culture of Iran is very rich, and many people are fascinated by it.

He exercises every day, so he always feels well in mind and body.

In this chemical experiment, we will observe the reaction using ammonium phosphate.

Ammonium carbonate is a compound commonly used in inorganic chemistry.

In chemistry class, I learned about the properties of ammonium chloride.

Ammonium nitrate is widely used in the manufacture of fertilizers and explosives.