来自《耶鲁大学开放课程：基础物理 第12集 第12集》
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You have to follow this very carefully.你们必须认真听讲 -
When you and I crossed,当你和我相遇时 -
remember that was at the origin of coordinates,记住这是坐标原点 -
At that instant when our origins touched,当我们的坐标原点接触时 -
let us emit a flash of light.让我们发出一束闪光 -
Okay, maybe when the origins touched, there's a spark,也许当我们的原点接触时会迸出火花 -
the light signal goes out光信号向外发出 -
and the light signal is detected here, by a light detector.在这里被一个光探测器检测到 -
That second event,第二个事件 -
detection of the pulse,检测光脉冲 -
it has a coordinates (x,t) for me;它对于我来说坐标为 (x,t) -
it has a coordinates (x',t') for you.对于你来说坐标为 (x',t')