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The roof of the Olympic Stadium for the 2012 London Olympic Games has been completed, the Olympic Delivery Authority announced on July 22.

The stadium's roof is made up of 112 panels of white material stretched between an outer truss and an inner tension ring.

The roof has a total area of 45,000 square meters, providing comfortable conditions for athletes and good protection for two-thirds of the spectators.

(Photo: Xinhua)

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