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Visitors watch a displayed tripod on Chinese Ding Culture Exhibition in Zhengzhou, capital of central China's Henan Province, Sept. 28, 2013. The exhibition opened here Friday Sept. 27. (Xinhua/Zhu Xiang)

Visitors watch the displayed tripods on Chinese Ding Culture Exhibition in Zhengzhou, capital of central China's Henan Province, Sept. 28, 2013. The exhibition opened here Friday Sept. 27. (Xinhua/Zhu Xiang)