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But what about someone outside? What do she see?
但车厢外的人呢？她会看见什么状况？
From her perspective,with the train moving forward.
从她的角度来看 由于火车往前行驶
the beam of light needs to travel a little bit further before it reaches the man at the front.
前面的人需要多一点时间才能看到光束
On the other hand,the light moving towards the man at the back.
而另一方面 往后移动的火光
has a slightly shorter distance to go,since he is moving towards it.
需要移动的距离较短 因为后面的人朝着火光移动
So,she sees the light reach the man at the back before it hits the chap at the front.
因此她先看见火光传往后面的人 再传到前面的人
What that means is that an event on a moving train.
有意思的是 行进列车上发生的事
takes place simultaneously if you're on the train.
若同在列车上就觉得是同时发生
But at different times when you're standing on the platform.
但若在月台上就会觉得有时间差
Stop a moment.and think about the implication of that.
稍待片刻 想想这件事有何含义
It means that we can't say if the events really happen at the same time or not.
这表示我们无法确定 事情是否真的同时发生
Reality itself depends on where you are.
现实本身取决于人的所在位置
