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本期内容：
SpaceX, Elon Musk’s rocketry company, successfully launched a spy satellite for America’s Department of Defense into orbit from the Kennedy Space Centre in Florida. It was the first flight SpaceX had made for the military. The company is keen to prove itself a reliable launch provider for government and commercial operations.
Rocketry: 火箭运用
Defense：防卫
Orbit：轨道
Be keen：迫切做某事
Commercial：商业的
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