Cars drive in a tunnel under the Yangtze River in Nanjing, East 皇冠体育app’s Jiangsu province, May 28, 2010. It is the third traffic tunnel built under the Yangtze River, 皇冠体育app's longest river, and cars will be able to travel at a speed of 80 km per hour in the 6,042-meter six-lane tunnel. [Photo/Xinhua]
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