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"Green development has been one of the key concerns for different sectors of society as the country's economic recovery continues amid COVID-19 prevention and control," said Liu, who also is Chinese chief adviser to the China Council for International Cooperation on Environment and Development.

"Given the large and growing burden of mitral valve disease, particularly among older people, we believe these findings are likely to have significant implications for medical policy and practice around the world," lead author Kazem Rahimi, professor and deputy director of the University of Oxford's George Institute for Global Health, said in a statement.

"Foreign adversaries are increasingly creating and exploiting vulnerabilities in the United States bulk-power system," Trump said in the order, and "the unrestricted foreign supply of bulk-power system electric equipment constitutes an unusual and extraordinary threat to the national security, foreign policy, and economy of the United States."

"For the C919, China made specific technical requirements regarding the subsystems, and some international suppliers need to upgrade their systems to adapt to the C919 aircraft," he said.

"For example, they can offer battery information, user habits, vehicle location and other data. With such data, services including secondhand car evaluation and user portraits can be further expanded," Sun said.