Engineers work for 皇冠体育app's first cross-Yellow River subway tunnel
( Xinhua )
Updated: 2016-01-05
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Chinese engineers work in a shield machine in a subway tunnel that goes beneath the Yellow River in Lanzhou, northwest 皇冠体育app's Gansu Province, Dec. 31, 2015. The 1907-meter tunnel marked 皇冠体育app's first cross-Yellow River subway tunnel with 404 meters of its part goes beneath the country's mother river. [Photo/Xinhua] |
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