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China's heavy-lift Long March 5 rocket blasts off from its launch centre in Wenchang, south China's Hainan province on December 27, 2019. - China on December 27 launched one of the world's most powerful rockets in a major step forward for its planned mission to Mars in 2020. (Photo by STR / AFP) / China OUT (Photo by STR/AFP via Getty Images)
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US President Donald Trump (L) and China's President Xi Jinping leave a business leaders event at the Great Hall of the People in Beijing on November 9, 2017.
Donald Trump urged Chinese leader Xi Jinping to work "hard" and act fast to help resolve the North Korean nuclear crisis, during their meeting in Beijing on November 9, warning that "time is quickly running out". / AFP PHOTO / Nicolas ASFOURI        (Photo credit should read NICOLAS ASFOURI/AFP via Getty Images)
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US President Donald Trump (L) and China's President Xi Jinping leave a business leaders event at the Great Hall of the People in Beijing on November 9, 2017. Donald Trump urged Chinese leader Xi Jinping to work "hard" and act fast to help resolve the North Korean nuclear crisis, during their meeting in Beijing on November 9, warning that "time is quickly running out". / AFP PHOTO / Nicolas ASFOURI (Photo credit should read NICOLAS ASFOURI/AFP via Getty Images)
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LOS ANGELES, CALIFORNIA - DECEMBER 19: Former Vice President Joe Biden speaks during the Democratic presidential primary debate at Loyola Marymount University on December 19, 2019 in Los Angeles, California. Seven candidates out of the crowded field qualified for the 6th and last Democratic presidential primary debate of 2019 hosted by PBS NewsHour and Politico. (Photo by Justin Sullivan/Getty Images)
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LOS ANGELES, CALIFORNIA - DECEMBER 19: Former Vice President Joe Biden speaks during the Democratic presidential primary debate at Loyola Marymount University on December 19, 2019 in Los Angeles, California. Seven candidates out of the crowded field qualified for the 6th and last Democratic presidential primary debate of 2019 hosted by PBS NewsHour and Politico. (Photo by Justin Sullivan/Getty Images)
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US and Chinese flags are seen as Secretary of State Mike Pompeo and China's Foreign Minister Wang Yi  meet at the US Department of State May 23, 2018 in Washington, DC. (Photo by Brendan Smialowski / AFP)        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
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US and Chinese flags are seen as Secretary of State Mike Pompeo and China's Foreign Minister Wang Yi meet at the US Department of State May 23, 2018 in Washington, DC. (Photo by Brendan Smialowski / AFP) (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
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