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Chen said the new generation is 10 times stronger than the second generation in terms of overall service capability.

Cheng Yandong, general manager of Beijing-based ad company Sifang China, said this year would be challenging for the sector since it's more difficult to attract attention and win trust from consumers.

Chen's lawyer said Chen took the initiative to go to police after learning about Xu's death from media reports, but prosecutors said Chen's confession could not be considered legally valid because it was not clear.

Cheng Yajing, 43, has studied and planted the succulents for more than 20 years, and is also a senior gardener in Beijing Botanical Garden, which has cultivated more than 2,000 species, making it the country's largest data source of succulents.

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