Runners climb up stairs during the vertical marathon at the China World Summit Wing Hotel of the World Trade Center Tower 3 in Beijing on August 3, 2012. [Photo by Cui Meng/chinadaily.com.cn][Photo by Cui Meng/chinadaily.com.cn]
A runner climbs up stairs during the vertical marathon at the China World Summit Wing Hotel of the World Trade Center Tower 3 in Beijing on August 3, 2012. [Photo by Cui Meng/chinadaily.com.cn]
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