The drainage system in this area is very efficient.

His standard of living has improved significantly.

He led the army as a generalissimo.

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

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

He was told by the doctor that he might have been infected with hydrophobia.

The Egyptian water lily is a very beautiful flower.

The Nymphaea lotus is known for opening its beautiful flower at night.

There is a beautiful fountain in the center of the park.

My friend lives in North Carolina.