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China's national high-tech zones play a vital role in underpinning innovation-driven development and establishing valuable experience for China's high-quality economic development, Xu added.

"We hope the United States will stop blaming others for its own failures, as it helps neither its own anti-epidemic efforts nor the international anti-epidemic efforts," Hua said. "What's worse, it will have a serious, negative impact on developing countries in urgent need of international support."

"We look forward to working with the Mekong countries to deepen and expand Lancang-Mekong cooperation, and provide stronger impetus for the development and prosperity in our sub-regions and beyond," said Li.

The lake has become a key habitat for wintering of more and more migratory birds, with over 100,000 birds making a stop here during migration every year, including rare species like whooper swans and black-necked cranes, according to He Yubang, head of the Qinghai Lake national nature reserve's administration.