Contestants do brickwork during a trial of the 2018 ChinaSkills Competition in Guangzhou, capital of south China's Guangdong Province, June 25, 2018. A series of trial events in the 2018 ChinaSkills Competition kicked off in Guangzhou on Monday. By holding trial events in Guangzhou and Shanghai respectively, the 2018 ChinaSkills Competition will select qualified candidates to make up team China for the WorldSkills Kazan 2019.(Xinhua/Liang Xu)