c We know it's very specific for light because in this equation is c, the speed of light. So any time you go to use this equation, if you're trying to use it for an electron, just ask yourself first, does an electron travel at the speed of light?

我们知道它只对光适用是因为在这个方程里有,光速，所以下次你们用这个方程前，如果你们要把它用到一个电子上，先问问你自己，电子的运动速度是光速吗？

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The timing, speed, and specific sectors where this plays out may not all be evident today.

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It generates detailed reports giving specific site speed recommendations.

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The revamp uses a simple web interface to let us build free sports apps based on criteria as simple as distance and speed through to more specific measurements like heart rate and pressure.

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