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

Groundwater pollution has become a serious environmental problem.

The police used a water cannon against the demonstrators.

The police used a water cannon against the demonstrators.

This lake is known as a dangerous body of water.

He was admitted to a mental hospital after attempting suicide.

I have visited the Basque region in Spain.

Midori was wearing a green dress.

This weight is very heavy.

Wednesday is the day of my piano lesson.