A girl holds a book on the book fair in Porto, the second largest city of Portugal, on Sept. 1, 2017. The 17-day book fair will end on Sept. 17. (Xinhua/Zhang Liyun)
A girl holds a book on the book fair in Porto, the second largest city of Portugal, on Sept. 1, 2017. The 17-day book fair will end on Sept. 17. (Xinhua/Zhang Liyun)
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