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Chen Shengdou, director of the China Agro-tech Extension Association, said China has more than 50,000 units of agricultural drones in operation, topping the world's list, with an area of 30 million to 33 million hectares of crops that have been sprayed with pesticides and fertilizers by such drones.

Chen Meiling and Yang Xiaotong contributed to this story.

Chen said Codemao has now established code training partnership with more than 17,000 public schools.

Chen Hao, secretary of the CPC Yunnan provincial committee, said provincial authorities have prioritized the preservation of the traditional culture of ethnic groups and the protection of the ecology and environmental while reducing poverty. Yunnan's environmental efforts are crucial since it is the source of a number of important national and international rivers, he said.

Chen Miaolin, chairman of New Century Tourism Group told Xinhua his hotels tried to introduce a wedding meal that consisted of six dishes and one soup per table, but the customers insisted they one 12 dishes and one soup.