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By David McAlary Washington 26 June 2006 Members of the space shuttle Discovery crew leave the Operations and Checkout building during a count down dress rehearsal for flight STS-121 at the Kennedy Space Center in Cape Canaveral, Flarida on June 15,
发表于:2019-01-06 / 阅读(124) / 评论(0)
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Ancient Mayan Artwork, Calculations Discovered Xultun was the largest city in the ancient Mayan empire in Central America, where, at its height, an estimated 90,000 people lived and worked among pyramids, inscribed monuments, water reservoirs and spo
发表于:2019-01-13 / 阅读(83) / 评论(0)
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The U.S. Postal Service is facing financial difficulties as more and more Americans use the Internet to send messages and pay bills. Top officials from the postal service are now asking Congress for permission to stop Saturday delivery as part of eff
发表于:2019-01-13 / 阅读(68) / 评论(0)
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