Photo taken on July 6, 2020 shows the construction site of the Vientiane to Vangvieng section of China-Laos expressway in Vientiane, Laos. (Photo by Liu Ailun/Xinhua)

Photo taken on July 6, 2020 shows the construction site of the Vientiane to Vangvieng section of China-Laos expressway in Vientiane, Laos. (Photo by Liu Ailun/Xinhua)

Photo taken on July 6, 2020 shows the construction site of the Vientiane to Vangvieng section of China-Laos expressway in Vientiane, Laos. (Photo by Liu Ailun/Xinhua)

Photo taken on July 6, 2020 shows the construction site of the Vientiane to Vangvieng section of China-Laos expressway in Vientiane, Laos. (Photo by Liu Ailun/Xinhua)

Photo taken on July 6, 2020 shows the construction site of the Vientiane to Vangvieng section of China-Laos expressway in Vientiane, Laos. (Photo by Liu Ailun/Xinhua)