There are many different ur-races in the world.

The boat races were held on the river.

Circuit races are popular among racing enthusiasts.

There are many claiming races at the racetrack today.

There were many foot races at the track meet.

The mill-races were used to power the water mills in the village.

The shuttle races were held at the stadium.

The Ur-races are ancient civilizations that existed long before recorded history.

The races to the bottom have led to a decline in working conditions.

The races to the top were highly competitive.