Workers of China's Sinohydro Corporation Limited work at the construction site of the Huye-Kibeho-Munini Road Upgrading Project in Huye district, Southern Province of Rwanda, on May 31, 2019. The 66-kilometer project stretches from Huye district to Nyaruguru district in Southern Province of Rwanda. (Photo: Xinhua)

Workers of China Road and Bridge Cooperation (CRBC) work at the construction site of New Bugesera International Airport Expressway Project in Kigali, Rwanda, on May 14, 2019. The 13.8-kilometer project will renovate the current road and upgrade it to an expressway with four lanes. (Photo: Xinhua)

Workers of China Road and Bridge Cooperation (CRBC) work at the construction site of New Bugesera International Airport Expressway Project in Kigali, Rwanda, on May 14, 2019. The 13.8-kilometer project will renovate the current road and upgrade it to an expressway with four lanes. (Photo: Xinhua)

A worker of China Road and Bridge Cooperation (CRBC) works at the construction site of New Bugesera International Airport Expressway Project in Kigali, Rwanda, on May 14, 2019. The 13.8-kilometer project will renovate the current road and upgrade it to an expressway with four lanes. (Photo: Xinhua)

Workers of China's Sinohydro Corporation Limited work at the construction site of the Huye-Kibeho-Munini Road Upgrading Project in Huye district, Southern Province of Rwanda, on May 31, 2019. The 66-kilometer project stretches from Huye district to Nyaruguru district in Southern Province of Rwanda. (Photo: Xinhua)

Workers of China's Sinohydro Corporation Limited work at the construction site of the Huye-Kibeho-Munini Road Upgrading Project in Huye district, Southern Province of Rwanda, on May 31, 2019. The 66-kilometer project stretches from Huye district to Nyaruguru district in Southern Province of Rwanda. (Photo: Xinhua)