既然上述两种解释会导致同样的结果,那么你选定任何一种解释都可以。不论任何时候,只要两件事物两种情况是相对的,那你就可以选定其中一种解释。逆真理亦真,每当你从有同样可能的两件事物中选定其中之一时,那么这两种事物之间就是相对的。
There is no reason, except convenience, for choosing one explanation over the other. The relative speed between the trains remains the same, 10 mph; and the end result will be the same.
除为了方便这个理由而外,我们选定了一种解释而不选另一种解释根本就没有其他别的原因。如果两列火车之间的相对速度依然相同,都是每小时10英里,那么最终的结果也会是相同的。
Now let's suppose that both trains are at the railroad station loading and unloading passengers and baggage. A half-hour passes. As we look at the other train through our window, we see that our train seems to start moving, smoothly and slowly. For a minute or so, our train seems to travel at a uniform speed. Our special speedometer shows that the relative speed between the two trains is 20 mph. But as we look out our window, we suddenly see the last coach of the other train disappear from sight and notice the motionless station behind it. So we are not moving after all. The other train has been moving!
现在我们假设两列火车都在火车站上在上下乘客或装卸行李。过了半小时以后,当我们透过车窗看另一列火车时,我们看到我们所乘的火车好像是在缓慢地平稳地开始开动了。约有一分钟左右,我们所乘的火车似乎是在以均匀的速度向前运行。我们特制的测速仪显示这两列火车的相对速度是每小时20英里。但当我们往窗外一看,这才突然看见另一列火车的最后一节车厢从我们的视野中正在消失,于是我们看到那一列火车后面留下的是不动的火车站。所以,我们所乘的火车根本就没有开动。原来是另外一辆火车在开动!
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