In this system the detected signal difference between two neighbouring instantaneous times is served as the effective signal, and the system noise points at the detector noise.

它将相邻两瞬时所检测到的信号差值作为有效信号值，系统噪声则是探测器噪声。

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Without conscious intent and the synchronizing signal of short iterations it is hard to notice the difference between being on the path and off the path unless you stay on the path for a while.

如果不是有意识地打算这样做，也没有短期迭代的同步信号，那么除非你在这条路上呆了很久，否则就很难注意到是否走错了路。

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Now they do say in the paper "It is worth stressing that this measurement does not rely on the difference between a start (t0) and a stop signal but on the comparison of two event time distributions."

他们的确在论文中提到“值得注意的是这一测量并不依赖于开始(t0)与结束信号之间的时间差，而是取决于两个事件的时间分布。”

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But taken together, they can make a difference and they send a signal that we are serious about changing how government operates,"

VOA: standard.2009.04.20

But while each of the previous cases seems almost lost to memory now, it is the national outpouring of outrage from people of all backgrounds in response to the Trayvon Martin case that could signal the difference between the last century and this one.

CNN: Trayvon's killing and Florida's tragic past

The difference is that the signal for "Game Over, " in this case a digital tombstone, pops up much later.

CNN: Virtual Nurture

Even if these figures are approximate, and if the structure of their economies goes some of the way to explaining these difference, they certainly signal an immense margin for improvement.

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