Staff of the China Railway Guangzhou Engineering Group (CRECGZ) pose for a group photo at the entrance to the Ban Nakok Tunnel in northern Laos' Oudomxay Province, on June 21, 2020. China Railway Guangzhou Engineering Group (CRECGZ) drilled through the Ban Nakok Tunnel, the second longest tunnel along the China-Laos railway, on Sunday. (CRECGZ/Handout via Xinhua)
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