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Aerial photo taken on April 20, 2018 shows the view of advection fog above Qingdao, a coastal city in east China's Shandong Province. (Xinhua/Lu Hui)
Aerial photo taken on April 20, 2018 shows the view of advection fog above Qingdao, a coastal city in east China's Shandong Province. (Xinhua/Lu Hui)