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Society: 'Pipe doctors' maintain water supply systems

They work in the middle of the night to maintain the water supply systems in cities. Wang Meng and Liu Xiaoshuang are maintenance workers at a water company in Qingdao, Shandong province. Just like doctors who use stethoscopes to examine patients, they use listening devices to check for water leaking from underground pipes. To avoid ambient noises that disturb their work, they listen for the sound of leaks from 10 pm to 2 am, and they inspect about 10 kilometers of pipes every night.