He made a substantial contribution to economics

The company gave him a gold watch in acknowledgement of his services

The robots are sure to contribute to the world

He was awarded a knighthood in acknowledgement of his services to the nation

The more skills one masters, the greater contribution one can make to society

Since many organizations are putting effort into recycling in order to restore the natural environment, why won't you contribute to reforestation

We cannot tell how much that great statesman has done for his country

Those people contributed greatly to world peace

The summit conference was held for world peace

The summit conference made a contribution to the peace of the world