宇宙之钥

So what's the problem?

这是怎么回事？

Anyone can understand that speed is relative to your perspective.

大家都知道 速度多少是相对于观察点的

But when you remember that unlike the speed of the toy train.

不同于玩具火车的车速

the speed of light is fixed no matter what your perspective.

无论从任何观察点 光速始终保持恒定

then that common sense view things starts to break down.

因此一般的观点就开始瓦解

To explain why Einstein imagined a train,too.

为了解释原因 爱因斯坦也想象出一列火车

Only his was full-sized.

只不过是真实大小的

He devised a thought experiment,asking how something as simple as the lighting of a cigarette light tip.

他设计了一项思考实验 探寻像点燃打火机这么简单的事

would look to people with different points of view.

为何不同的人会看到不同的结果

He imagined a man playing with his lighter in the center of a railway car.

他想象有人在车厢中央玩打火机

being watched by two people at either end.

车厢两头各有一个人在看

Both at exactly the same distance from the lighter.

两人与打火机的距离相等

Einstein said the interesting question is not what do these people see.

爱因斯坦表示值得探究的问题 不在这两人看见了什么

But when do they see it.

而是何时看见

Because they're in the same car or moving together at the same speed.

因为他们都在同一节车厢里以相同的速度前进

the two observers see the light at exactly the same time.

两名观察的人都在同一时间看见火光

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、experiment

实验

The astronauts are conducting a series of experiments to learn more about how the body adapts to weightlessness.

那些宇航员正在进行一系列实验，以更多地了解身体如何适应失重状态。

a proposed new law on animal experiments.

有关动物实验的最新法规提案

（用…）做实验

In 1857 Mendel started experimenting with peas in his monastery garden.

1857年，孟德尔开始在修道院的菜园里用豌豆做实验。

The scientists have experimented on the tiny neck arteries of rats.

科学家们已经在老鼠细小的颈动脉上做了实验。

进行试验;试用

if you like cooking and have the time to experiment.

如果你喜欢烹饪而且有时间尝试的话

He believes that students should be encouraged to experiment with bold ideas.

他认为应该鼓励学生们将大胆的观念付诸试验。