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mars up close

火星的“天外来客”

作者:Visits to Mars
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火星的“天外来客”

Is there water or life on Mars? How can we find out? We have to pay a visit (拜访) to Mars. For the past 50 years, that is what scientists have been trying to do. Humans can’t go to Mars right now. A spacecraft can make the trip.
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