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The mission -- consisting of an orbiter, a lander, and a rover -- is "the most ambitious thing one could do on a first attempt," says John Logsdon, a space policy expert at George Washington University.

Being each other's largest neighboring country, China and Russia are the world's largest countries in terms of population and territorial area respectively, he said, noting that the larger a country's size, the greater its responsibility.

Walking between apartment blocks, Xi looked up and waved to residents under lockdown who stuck out their heads from their windows and balconies to greet him.

He said African countries including Zambia delivered invaluable support to China in the early days of its epidemic fight, and China, who empathized with them when they were hit by the virus, took the lead in providing support and anti-epidemic supplies as well as in sharing the experience in virus prevention and control so as to help improve their anti-coronavirus work.

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