London unveils first giant Olympic Rings

A set of Olympic Rings, 20 meters long and 9 meters wide, is seen after being unveiled at the St Pancras International Station in London, March 3, 2011. The St Pancras Station is the terminal of the Eurostar trains which will connect continental Europe and the London Olympic Park during the 2012 London Olympic Games. It will take only 7 minutes to reach the Olympic Park by high-speed trains from the station. [Photo/Xinhua]