Photo taken on Dec. 28, 2013 shows elevators at the Tianmenshan Mountain tourist tunnel in Zhangjiajie National Forest Park in central China's Hunan Province. The Tianmenshan Mountain tourist tunnel project is the first in the world to use elevator in a mountain tunnel. Elevators were put into use on Saturday and are expected to transport 6,000 tourists per hour. (Xinhua/Wang Jingqiang) |
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