A whirligig beetle is swimming in the pond.

He is an expert in hydrology, and his research is highly valued around the world.

She bought a new sukumizu.

Lye water is necessary to make Chinese noodles.

There is a lot of spirogyra floating in this pond.

This area is rich in subterranean rivers, which serve as a source of groundwater.

Sun-warmed water is water warmed by the sunlight.

He is relaxing by smoking a hookah.

In this chemical reaction, hydration plays an important role.

The flow of the Wei River is quiet and beautiful.