看起来非常确定的事情是:没有信号,更不用说物质,可以比光传播的速度快。
For it seems as certain as anything can be that no signal-still less any material object-can ever travel faster than light.
尽管先前的研究已经证实,光的“群速度”可以超越光速c,而“信号传播速度”——光携带的信息的传播速度——不能超越光速。
Although previous studies have found that the "group velocity" of light can travel faster than c, the "signal velocity" -the speed at which information travels -cannot.
尽管先前的研究已经证实,光的“群速度”可以超越光速c,而“信号传播速度”——光携带的信息的传播速度——不能超越光速。
Although previous studies have found that the "group velocity" of light can travel faster than c, the "signal velocity" - the speed at which information travels - cannot.
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