Readers select books at a book store in Gaoxin District of Xi'an, capital of northwest China's Shaanxi Province, Jan. 14, 2019. Xi'an has been promoting public reading in recent years, with book stores increasing at a high speed. As of December 2018, the number of book retail outlets in Xi'an has nearly reached 2,000, more than doubled since the end of 2017. (Xinhua/Shao Rui)

Readers are seen at a book store in Gaoxin District of Xi'an, capital of northwest China's Shaanxi Province, Jan. 14, 2019. Xi'an has been promoting public reading in recent years, with book stores increasing at a high speed. As of December 2018, the number of book retail outlets in Xi'an has nearly reached 2,000, more than doubled since the end of 2017. (Xinhua/Shao Rui)

Readers are seen at a book store in Weiyang District of Xi'an, capital of northwest China's Shaanxi Province, Jan. 14, 2019. Xi'an has been promoting public reading in recent years, with book stores increasing at a high speed. As of December 2018, the number of book retail outlets in Xi'an has nearly reached 2,000, more than doubled since the end of 2017. (Xinhua/Shao Rui)

A reader watches a wall of books at a book store in Weiyang District of Xi'an, capital of northwest China's Shaanxi Province, Jan. 14, 2019. Xi'an has been promoting public reading in recent years, with book stores increasing at a high speed. As of December 2018, the number of book retail outlets in Xi'an has nearly reached 2,000, more than doubled since the end of 2017. (Xinhua/Shao Rui)

Staff members arrange books at a book store in Gaoxin District of Xi'an, capital of northwest China's Shaanxi Province, Jan. 14, 2019. Xi'an has been promoting public reading in recent years, with book stores increasing at a high speed. As of December 2018, the number of book retail outlets in Xi'an has nearly reached 2,000, more than doubled since the end of 2017. (Xinhua/Shao Rui)

Readers are seen at a book store in Qujiang new district of Xi'an, capital of northwest China's Shaanxi Province, Jan. 15, 2019. Xi'an has been promoting public reading in recent years, with book stores increasing at a high speed. As of December 2018, the number of book retail outlets in Xi'an has nearly reached 2,000, more than doubled since the end of 2017. (Xinhua/Shao Rui)

Readers are seen at a book store in Weiyang District of Xi'an, capital of northwest China's Shaanxi Province, Jan. 14, 2019. Xi'an has been promoting public reading in recent years, with book stores increasing at a high speed. As of December 2018, the number of book retail outlets in Xi'an has nearly reached 2,000, more than doubled since the end of 2017. (Xinhua/Shao Rui)

A reader visits an exhibition area at a book store in Weiyang District of Xi'an, capital of northwest China's Shaanxi Province, Jan. 14, 2019. Xi'an has been promoting public reading in recent years, with book stores increasing at a high speed. As of December 2018, the number of book retail outlets in Xi'an has nearly reached 2,000, more than doubled since the end of 2017. (Xinhua/Shao Rui)

Readers are seen at a book store in Weiyang District of Xi'an, capital of northwest China's Shaanxi Province, Jan. 14, 2019. Xi'an has been promoting public reading in recent years, with book stores increasing at a high speed. As of December 2018, the number of book retail outlets in Xi'an has nearly reached 2,000, more than doubled since the end of 2017. (Xinhua/Shao Rui)

A reader visits an artwork sales area at a book store in Weiyang District of Xi'an, capital of northwest China's Shaanxi Province, Jan. 14, 2019. Xi'an has been promoting public reading in recent years, with book stores increasing at a high speed. As of December 2018, the number of book retail outlets in Xi'an has nearly reached 2,000, more than doubled since the end of 2017. (Xinhua/Shao Rui)

Readers are seen at a book store in Weiyang District of Xi'an, capital of northwest China's Shaanxi Province, Jan. 14, 2019. Xi'an has been promoting public reading in recent years, with book stores increasing at a high speed. As of December 2018, the number of book retail outlets in Xi'an has nearly reached 2,000, more than doubled since the end of 2017. (Xinhua/Shao Rui)

A citizen reads at a book store in Gaoxin District of Xi'an, capital of northwest China's Shaanxi Province, Jan. 14, 2019. Xi'an has been promoting public reading in recent years, with book stores increasing at a high speed. As of December 2018, the number of book retail outlets in Xi'an has nearly reached 2,000, more than doubled since the end of 2017. (Xinhua/Shao Rui)