北京
Li Mingsong, a sanitation systems maintainer at Qiqihar North Depot — China's northernmost passenger train depot . He & 39 colleagues ensure hygienic travel across 138 conventional trains & 256 onboard restrooms. (Photo by Yang Lei / China Youth Daily)
By Wang Xinyuan,Li Yuanyuan and Sun Jiamin(intern)/China Youth Daily
Source：China Youth Daily
來源：中國青年報客戶端
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