Visitors consult at an exhibition area for China's Hong Kong Special Administrative Region at the Fifth China Beijing International Fair for Trade in Services in Beijing, May 28, 2018. The fair kicked off here on Monday and will last until June 1. More than 130 seminars, meetings and trade activities have been planned for the fair. (Xinhua/Zhang Chenlin)

An exhibitor displays a traditional lantern at the Fifth China Beijing International Fair for Trade in Services in Beijing, May 28, 2018. The fair kicked off here on Monday and will last until June 1. More than 130 seminars, meetings and trade activities have been planned for the fair. (Xinhua/Li Xin)

Visitors try out shopping at an unmanned store at the Fifth China Beijing International Fair for Trade in Services in Beijing, May 28, 2018. The fair kicked off here on Monday and will last until June 1. More than 130 seminars, meetings and trade activities have been planned for the fair. (Xinhua/Li Xin)

Visitors watch a self-service library at the Fifth China Beijing International Fair for Trade in Services in Beijing, May 28, 2018. The fair kicked off here on Monday and will last until June 1. More than 130 seminars, meetings and trade activities have been planned for the fair. (Xinhua/Li Xin)

A visitor watches logistic robots at the Fifth China Beijing International Fair for Trade in Services in Beijing, May 28, 2018. The fair kicked off here on Monday and will last until June 1. More than 130 seminars, meetings and trade activities have been planned for the fair. (Xinhua/Zhang Chenlin)

Visitors watch a drone at the Fifth China Beijing International Fair for Trade in Services in Beijing, May 28, 2018. The fair kicked off here on Monday and will last until June 1. More than 130 seminars, meetings and trade activities have been planned for the fair. (Xinhua/Zhang Chenlin)

Visitors try out VR game at the Fifth China Beijing International Fair for Trade in Services in Beijing, May 28, 2018. The fair kicked off here on Monday and will last until June 1. More than 130 seminars, meetings and trade activities have been planned for the fair. (Xinhua/Zhang Chenlin)

Visitors try out VR game at the Fifth China Beijing International Fair for Trade in Services in Beijing, May 28, 2018. The fair kicked off here on Monday and will last until June 1. More than 130 seminars, meetings and trade activities have been planned for the fair. (Xinhua/Zhang Chenlin)

An exhibitor makes special tea at the Fifth China Beijing International Fair for Trade in Services in Beijing, May 28, 2018. The fair kicked off here on Monday and will last until June 1. More than 130 seminars, meetings and trade activities have been planned for the fair. (Xinhua/Li Xin)

Visitors consult at an exhibition area for China's Hong Kong Special Administrative Region at the Fifth China Beijing International Fair for Trade in Services in Beijing, May 28, 2018. The fair kicked off here on Monday and will last until June 1. More than 130 seminars, meetings and trade activities have been planned for the fair. (Xinhua/Li Xin)

Visitors consult at an exhibition area for e-commerce of Fengtai District at the Fifth China Beijing International Fair for Trade in Services in Beijing, May 28, 2018. The fair kicked off here on Monday and will last until June 1. More than 130 seminars, meetings and trade activities have been planned for the fair. (Xinhua/Li Xin)