Pupils demonstrate smiley cards to greet the upcoming World Smile Day at a primary school in Qinhuangdao, north China's Hebei Province, May 7, 2019. World Smile Day is celebrated on May 8 every year. [Xinhua/Cao Jianxiong]
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Pupils demonstrate smiley cards to greet the upcoming World Smile Day at a primary school in Qinhuangdao, north China's Hebei Province, May 7, 2019. World Smile Day is celebrated on May 8 every year. [Xinhua/Cao Jianxiong]
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