People read books in Zhengzhou library in Zhengzhou, capital of central China's Henan Province, July 31, 2018. The library is packed with readers during the summer vacation. (Xinhua/Li An)

People read books in Zhengzhou library in Zhengzhou, capital of central China's Henan Province, July 31, 2018. The library is packed with readers during the summer vacation. (Xinhua/Li An)

People read books in Zhengzhou library in Zhengzhou, capital of central China's Henan Province, July 31, 2018. The library is packed with readers during the summer vacation. (Xinhua/Li An)

A girl reads books in Zhengzhou library in Zhengzhou, capital of central China's Henan Province, July 31, 2018. The library is packed with readers during the summer vacation. (Xinhua/Li An)

People read books in Zhengzhou library in Zhengzhou, capital of central China's Henan Province, July 31, 2018. The library is packed with readers during the summer vacation. (Xinhua/Li An)

A girl searches books in Zhengzhou library in Zhengzhou, capital of central China's Henan Province, July 31, 2018. The library is packed with readers during the summer vacation. (Xinhua/Li An)

People queue up to enter Zhengzhou library in Zhengzhou, capital of central China's Henan Province, July 31, 2018. The library is packed with readers during the summer vacation. (Xinhua/Li An)