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本期内容：
SpaceX, an American space startup, launched 11 communications satellites into orbit before returning the first stage of its Falcon 9 rocket to Cape Canaveral in Florida, where it made a powered landing. Reusing the first stage, which accounts for 70% of the rocket’s $54m cost, would make access to space much cheaper.
词义解析:
Startup：创业公司
communications satellites：通讯卫星
orbit：轨道
account for：占……
