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Students show smiley cards to celebrate World Smile Day at a primary school in Shijiazhuang, capital of north China's Hebei Province, May 8, 2018. World Smile Day is celebrated on May 8 every year. (Xinhua/Jia Minjie)
World Smile Day marked across China
Source: Xinhua| 2018-05-08 16:20:26|Editor: ZX
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