Three students watch the statue of Cyril and Methodius, the creators of Slavic language, in front of the National Library of Bulgaria in Sofia, Bulgaria on April 23, 2018. This year marks the 140th anniversary of the National Library of Bulgaria. (Xinhua/Zhan Xiaoyi)
World Book Day celebrated across world
Source: Xinhua| 2018-04-23 14:57:32|Editor: ZX
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