The trainees for the China-Laos railway's operation attend an inauguration ceremony for the intensive Chinese language learning class in Vientiane, Laos, June 23, 2020. The future China-Laos railway operation staff have started receiving Chinese language training at the Confucius Institute of the National University of Laos in the Lao capital Vientiane. (Photo by Chanthaphaphone Mixayboua/Xinhua)

The trainees for the China-Laos railway's operation attend an inauguration ceremony for the intensive Chinese language learning class in Vientiane, Laos, June 23, 2020. The future China-Laos railway operation staff have started receiving Chinese language training at the Confucius Institute of the National University of Laos in the Lao capital Vientiane. (Photo by Chanthaphaphone Mixayboua/Xinhua)