Students at high school in Qinghai start new semester amid strict prevention measures against COVID-

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A schedule of ventilation and disinfection is seen on the wall of a classroom at a high school in Haibei Tibetan Autonomous Prefecture, northwest China's Qinghai Province, March 14, 2020. Students at the high school have started their new semester amid strict prevention measures against the novel coronavirus. (Xinhua/Wu Gang)

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Students have a class at a high school in Haibei Tibetan Autonomous Prefecture, northwest China's Qinghai Province, March 14, 2020. Students at the high school have started their new semester amid strict prevention measures against the novel coronavirus. (Xinhua/Wu Gang)

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Students have meals at a canteen of a high school in Haibei Tibetan Autonomous Prefecture, northwest China's Qinghai Province, March 14, 2020. Students at the high school have started their new semester amid strict prevention measures against the novel coronavirus. (Xinhua/Wu Gang)

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Students wait in line to take meals at a canteen of a high school in Haibei Tibetan Autonomous Prefecture, northwest China's Qinghai Province, March 14, 2020. Students at the high school have started their new semester amid strict prevention measures against the novel coronavirus. (Xinhua/Wu Gang)

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Students have a class about the prevention and control of COVID-19 at a high school in Haibei Tibetan Autonomous Prefecture, northwest China's Qinghai Province, March 14, 2020. Students at the high school have started their new semester amid strict prevention measures against the novel coronavirus. (Xinhua/Wu Gang)