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距地球表面640千米的轨道上,NASA的“引力探测B”卫星--这颗耗资7亿美元,经过44年科研研制成的卫星,正在给大科学家爱因斯坦进行一场特殊的“考试”。
NASA's “Gravity Probe B” satellite, a 640-kilometer orbit off the surface of the Earth, is a $ 700 million, 44-year-old satellite that is being developed by the giant Scientist Einstein for a special “examination”.