Combination photo taken on April 20, 2014 shows people read respectively in a digital reading room (upper) and a traditional reading room in Shanxi Provincial Library in Taiyuan, capital of north China's Shanxi Province. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Yan Yan)

 

Pupils of Yong'anjie Elementary School read books in Henan Provincial Library in Zhengzhou, capital of central China's Henan Province, April 23, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Li An)

 

A student reads a book in a library of Jilin University in Changchun, capital of northeast China's Jilin Province, April 20, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Xu Chang)

 

A student reads a digital book in a library of Jilin University in Changchun, capital of northeast China's Jilin Province, April 20, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Xu Chang)

 

Pupils of Yong'anjie Elementary School read books in Henan Provincial Library in Zhengzhou, capital of central China's Henan Province, April 23, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Li An)

 

Pupils of Yong'anjie Elementary School read books in Henan Provincial Library in Zhengzhou, capital of central China's Henan Province, April 23, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Li An)

 

Resident Zhang Binbin arranges her book shelf at home in Changchun, capital of northeast China's Jilin Province, April 20, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Xu Chang)

 

Residents read books in Hebei Provincial Library in Shijiazhuang, capital of north China's Hebei Province, April 23, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Zhu Xudong)

 

A parent and her daughter read books at Shanxi Provincial Library in Taiyuan, capital of north China's Shanxi Province, April 20, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Yan Yan)

 

One reader (L) reads with electronic device and the other reads a traditional book at Shanxi Provincial Library in Taiyuan, capital of north China's Shanxi Province, April 20, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Yan Yan)

 

Residents read books in Hebei Provincial Library in Shijiazhuang, capital of north China's Hebei Province, April 23, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Zhu Xudong)

 

Children read books in Shanxi Provincial Library in Taiyuan, capital of north China's Shanxi Province, April 20, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Yan Yan)

 

A pupil reads a book in Henan Provincial Library in Zhengzhou, capital of central China's Henan Province, April 23, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Li An)

 

A student (R) writes a paper with a laptop while the other reads a book in a library of Jilin University in Changchun, capital of northeast China's Jilin Province, April 20, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Xu Chang)

 

Two readers read books at Shanxi Provincial Library in Taiyuan, capital of north China's Shanxi Province, April 20, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Yan Yan)

 

Students read with laptops in a library of Jilin University in Changchun, capital of northeast China's Jilin Province, April 20, 2014. The World Book Day is commemorated on April 23, aiming to promote reading, and boost the editorial industry and the protection of the intellectual property by copyrights. (Xinhua/Xu Chang)