A merchant from Vietnam arranges commodities in his shop at Hekou, a county along the China-Vietnam border in southwest China's Yunnan Province, April 11, 2017. Border trade in Hekou Port has been booming along the Chinese border with Vietnam, with total value of import and export reaching 10.63 billion yuan (1.5 billion U.S. dollars) in 2016, up 10.3 percent year on year. (Xinhua/Lin Yiguang)

Border residents from Vietnam convey commodities to pass the Hekou Port on the China-Vietnam border in Hekou County, southwest China's Yunnan Province, April 11, 2017. Border trade in Hekou Port has been booming along the Chinese border with Vietnam, with total value of import and export reaching 10.63 billion yuan (1.5 billion U.S. dollars) in 2016, up 10.3 percent year on year. (Xinhua/Lin Yiguang)

Photo taken on April 11, 2017 shows the Hekou Port on the China-Vietnam border in Hekou County, southwest China's Yunnan Province. Border trade in Hekou Port has been booming along the Chinese border with Vietnam, with total value of import and export reaching 10.63 billion yuan (1.5 billion U.S. dollars) in 2016, up 10.3 percent year on year. (Xinhua/Lin Yiguang)

Trucks drive through the Hekou Port on the China-Vietnam border in Hekou County, southwest China's Yunnan Province, April 11, 2017. Border trade in Hekou Port has been booming along the Chinese border with Vietnam, with total value of import and export reaching 10.63 billion yuan (1.5 billion U.S. dollars) in 2016, up 10.3 percent year on year. (Xinhua/Lin Yiguang)