Double rainbows are seen in the sky in Tekes County, northwest China's Xinjiang Uygur Autonomous Region, Aug. 14, 2012. (Xinhua/Sadat)

Double rainbows are seen in the sky in Tekes County, northwest China's Xinjiang Uygur Autonomous Region, Aug. 14, 2012. (Xinhua/Sadat)

A rainbow is seen in the sky in Tekes County, northwest China's Xinjiang Uygur Autonomous Region, Aug. 14, 2012. (Xinhua/Sadat)

A rainbow is seen in the sky in Tekes County, northwest China's Xinjiang Uygur Autonomous Region, Aug. 14, 2012. (Xinhua/Sadat)