A contestant operates a lathe machine 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. (Photo: Liang Xu/ Xinhua)
Contestants compete 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. (Photo:Shen Bohan/ Xinhua)
Contestants compete 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. (Photo:Shen Bohan/ Xinhua)
A contestant does 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. (Photo: Liang Xu/ Xinhua)
A contestant operates a machine 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. (Photo:Shen Bohan/ Xinhua)
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. (Photo: Liang Xu/ Xinhua)
A contestant operates a machine 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. (Photo:Shen Bohan/ Xinhua)
A contestant cuts stones 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. (Photo: Liang Xu/ Xinhua)
A contestant operates a machine 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. (Photo: Liang Xu/ Xinhua)
A contestant welds 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. (Photo:Shen Bohan/ Xinhua)
A contestant carves a stone 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. (Photo:Shen Bohan/ Xinhua)