How much do you know about Vietnam?

Photo taken on March 28, 2017 shows the Cat Linh-Ha Dong urban railway project under construction in Vietnam's capital Hanoi. The Cat Linh-Ha Dong urban railway project, about 13 km in length and allowing a maximum speed of 80 km per hour, is constructed by the 6th bureau of China Railway Engineering Corporation. [Photo/Xinhua]

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