Deuterium is one of the isotopes of hydrogen.

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.

I go to swimming lessons every Friday.

My test score was a perfect 100 points.

The aquifer in this area provides a very abundant water source.

He is good at solving algebraic equations.