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ZHANGJIAJIE, CHINA - JUNE 25:
Visitors view the glass-bottomed bridge receiving a safety test at Zhangjiajie Grand Canyon on June 25, 2016 in Zhangjiajie, Hunan Province of China. World\'s tallest and longest glass-bottomed bridge has been completed and took a global broadcast through television and internet medias to show its safety. More than thirty citizens and visitors thumped the bridge with hammer in the test event.
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