Villagers work at a salt field in Naxi Ethnic Township of Markam County in the city of Qamdo, southwest China's Tibet Autonomous Region, Oct. 20, 2023.This aerial photo taken on Oct. 20, 2023 shows salt fields in Naxi Ethnic Township of Markam County in the city of Qamdo, southwest China's Tibet Autonomous Region.(Xinhua/Sun Fei)