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美国海军和空军打算研制一种用冲压发动机推进的中等射程的空对空导弹,尺寸和“麻雀”差不多,计划到1985年代替“麻雀”,将可能
The U.S. Navy and the Air Force intend to develop a mid-range, medium-range air-to-air missile propelled by a ramjet engine that is about the size of a “sparrow,” and plans to replace “sparrow” by 1985.