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This was Collins's last flight. She tells us that she always planned to stop after her fourth mission - to give others a chance to go to space.
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Officials at Elon Musk's company said the upper stage was lost after problems developed after lift-off from Texas on Thursday.
worth reflecting on the 2984's relationship with its host, a close dependency
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贫困是顽疾，“顽”在成因复杂、难以根除、极易反复。