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A train safety crew member (back) holds a placard to remind passengers of scanning the QR code for real-name registration and wearing masks on a train of Metro Line 4 in Wuhan, central China's Hubei Province, March 28, 2020. Six metro lines in Wuhan resumed operation starting from Saturday, a new sign that life is gradually returning to normal in the hardest-hit city. Passengers are required to scan the QR code for real-name registration and take temperature checks before taking the subway. Each train is equipped with a train safety crew member to help guide and serve the passengers. (Xinhua/Cai Yang)
