This salt contains water of crystallization.

I use distilled water for the experiment.

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

He is an expert in hydrology and is conducting research on flood prevention.

His sister suffered for a long time because of noma.

Many dragonfly nymphs live in this pond.

Mr. Teramizu is my best friend.

She bought a new sukumizu.

This 'Mizufuda' is from an old era.

I saw a water rail in the park pond.