Oxygen, which is one of the chemical elements, is necessary for us to breathe.

Bismuth is one of the chemical elements, and its symbol is Bi.

In Chinese astronomy, a star named 'bi' means 'tail'.

He ate one apple.

Hydrogen is the most abundant element in the universe.

He is majoring in chemistry at university.

What does this symbol mean?

She is really a beautiful woman, isn't she?

Her small dog is very cute.

He is an expert in chemistry.