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美国宇航局(NASA)
美国宇航局 NASA AERONAUTICS SPACE
2008/1/22
National Aeronautics and Space Administration(NASA)(图)
NASA National Aeronautics and Space Administration 航空学
2007/12/21
Our Center, located in a Maryland suburb outside of Washington, DC, is home to the Nation’s largest organization of combined scientists and engineers dedicated to learning and sharing their knowledge ...