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A Chinese technician teaches a Lao worker to repair a machine for the tunnel construction of China-Laos railway in a steel processing yard in the south of northern Laos' Luang Prabang, Nov. 7, 2019. China-Laos railway tunnels' construction has been continuing to make lots of breakthroughs as the major tunnel Ban Ka No. 1 Tunnel near Luang Prabang was drilled through on Nov. 8 in the tropical mountains of northern Laos. (Photo by Kaikeo Saiyasane/Xinhua)
