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"We pledge that once the development and deployment of COVID-19 vaccine is completed in China, African countries will be among the first to benefit," said Xi.

"After a long time at home, this is our first family trip. The blue sky, clear water, flowers and beautiful scenery remain the same, but our mentality has changed," said Zeng.

Prayut also conveyed his sympathies over the floods hitting multiple places in southern China, and Xi expressed gratitude for that.

-- A subsidiary of China's largest oil refiner Sinopec put into operation the 12th of its 12 meltblown non-woven fabric production lines Saturday to meet the brisk demand of face mask producers.

Facing the "unknown, unexpected, and devastating disease," China launched a resolute battle to prevent and control its spread, the white paper said.