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- 问题详情：Formorethantwentyyearsscientistshavebeensearchingforsignsoflifeonotherplanets.Mostofthesesearcheshavebeendoneovertheradio.Thehopeisthatsomeoneinouterspacemaybetryingtogetintouchwithus.Scientistsalsohavesentradioandtelevisionmessagesonspaceshi...
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