The water service in my house has broken down.

He is majoring in applied mathematics at university.

Deuterium is one of the isotopes of hydrogen.

He is good at solving algebra problems.

I think it's important to get enough sleep.

She was wearing a new perfume.

Due to his somnambulism, he may walk around unconsciously in the middle of the night.

His poetry is as beautiful as a mirror flower, water moon.

The Fibonacci sequence appears in many phenomena in nature.

He is a professor of algebra.