• Some 900 active satellites are in orbit, and nearly half of them are American.

    轨道活跃900颗人造卫星而且几乎它们一半美国

    youdao

  • Some 900 active satellites are in orbit, and nearly half of them are American.

    轨道活跃900颗人造卫星而且几乎它们一半美国

    youdao

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