Aerial photo taken on May 16, 2018 shows the construction site of the Jingxi-Longbang expressway in the China-Vietnam border area in South China’s Guangxi Zhuang autonomous region. The 28.3-km expressway, linking the Jiuzhou Village of Xinjing township with the Longbang Port in Jingxi city bordering Vietnam, will open to traffic by the end of this year. [Photo/Xinhua]

Aerial photo taken on May 16, 2018 shows builders working at the construction site of the Jingxi-Longbang expressway in the China-Vietnam border area in South China’s Guangxi Zhuang autonomous region. The 28.3-km expressway, linking the Jiuzhou Village of Xinjing township with the Longbang Port in Jingxi city bordering Vietnam, will open to traffic by the end of this year. [Photo/Xinhua]

Aerial photo taken on May 16, 2018 shows the construction site of the Jingxi-Longbang expressway in the China-Vietnam border area in South China’s Guangxi Zhuang autonomous region. The 28.3-km expressway, linking the Jiuzhou village of Xinjing township with the Longbang Port in Jingxi city bordering Vietnam, will open to traffic by the end of this year. [Photo/Xinhua]

Aerial photo taken on May 16, 2018 shows builders working at the construction site of the Jingxi-Longbang expressway in the China-Vietnam border area in South China’s Guangxi Zhuang autonomous region. The 28.3-km expressway, linking the Jiuzhou village of Xinjing township with the Longbang Port in Jingxi city bordering Vietnam, will open to traffic by the end of this year. [Photo/Xinhua]

Aerial photo taken on May 16, 2018 shows the construction site of the Jingxi-Longbang expressway in the China-Vietnam border area in South China’s Guangxi Zhuang autonomous region. The 28.3-km expressway, linking the Jiuzhou village of Xinjing township with the Longbang Port in Jingxi city bordering Vietnam, will open to traffic by the end of this year. [Photo/Xinhua]