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"China and the WHO have been in close communication and cooperation on source tracing since COVID-19 broke out, and Chinese scientists have also been discussing this with scientists in other countries," he told a news briefing in Beijing.

"China has a great potential to expand domestic demand in city clusters and metropolitan areas, as a growing number of middle-income consumers will further stimulate demand by taking more flights. Besides, the urbanization rate is still low and development in different areas is uneven, and there exists untapped demand," she said.

"China has not only solved the basic demand for food for nearly 1.4 billion people, but is also close to moving from supplying sufficient food products to providing rich and nutritious diets for its people," he said.

"But we were also given a lot of valuable insights into the culture in China… it was a very good experience for us," she said.

"China has abundant resources of coal. The several varieties of coal are the main source for energy consumption. Promoting green and efficient coal production and use is equally important as developing new energy," said Liu Baohua, deputy head of the National Energy Administration.