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Duan said she is proud to have planted trees so far away and will continue making low-carbon choices to earn more virtual energy and plant more trees.
Dual-layer system
Dr Deborah Birx, coordinator of the White House task force on the virus, has called for "an aggressive balanced approach that is not being implemented" and warned that the pandemic could be about to enter a "deadly phase" with 100,000 infections a day.
Door-to-door visits are of great significance ahead of the national population census registration that will start on Nov 1 this year as census workers will get a clear picture of the area's housing statistics and inform residents of the upcoming census.
During President Xi Jinping's trip to the United States in April, the two sides agreed to engage in four dialogues.
