At the worst, these will amount to twenty hours-the time it takes a radio signal to span the orbit of Pluto, the outer-most planet.
最糟糕的情况也就是20小时，即无线电信号越过最远的冥王星的轨迹的时间。
At the worst, these will amount to twenty hours-the time it takes a radio signal to span the orbit of Pluto, the outer-most planet.
最糟糕的情况也就是20小时，即无线电信号越过最远的冥王星的轨迹的时间。
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