Many large dams have brought significant social and economic benefits.

We have built large dams to hold back water in a lake.

The project was first proposed in the 1970s, when a larger dam had been considered.

The building of large dams to hold the water can damage the environment.

The world is beginning to change its views on large dams.

Construction took place from 1922 to 1926 and, at the time, was the largest dam in Europe.

The dam was one of the first large dams in the South.

In the past, large dams have often been the focus of water storage efforts.

"The potential of large dams is not being realized," he said.

The ministry points out that China already has built more than 80,000 large dams.