宇宙之钥

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

重点讲解

1、perspective

（尤指受到某种思想、经验影响的）思考方法，态度，观点，角度

He says the death of his father 18 months ago has given him a new perspective on life.

他说18个月前父亲的去世让他对人生有了新的认识。

two different perspectives on the nature of adolescent development.

对青少年成长发育特点的两种不同观点

正确/不正确地看待（或判断）

Remember to keep things in perspective.

记住要客观看待事物。

It helps to put their personal problems into perspective.

这有助于正确看待他们的个人问题。

2、implication

可能引发的后果

The Attorney General was aware of the political implications of his decision to prosecute.

司法部长很清楚他决定起诉可能引发的政治后果。

The low level of current investment has serious implications for future economic growth.

当前低迷的投资水平会对未来的经济增长产生严重影响。

暗示;暗指;含意

The implication was obvious: vote for us or it will be very embarrassing for you.

弦外之音很明显：投票给我们,否则你会非常难堪。

The implication that marital infidelity enhances a leader's credibility is preposterous.

婚姻不忠会提升领导人可信度的暗示荒谬之极。