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"China deems breaking through key technology as a significant strategy. So far, Chinese enterprises have solved some problems in key components," the report said.

"But this is obviously forbidden and against the law," said Kucuk, as the class of students burst into laughter.

"But we know that mistrust remains high, and that it is difficult to move to implementation," Guterres said.

"But with the social and economic development, water shortages, damage to aquatic ecosystems and water contamination have become the main issues," he added.

"China has showed the effectiveness of its methods, and it is important for these methods to be shared," she added.