Unlike other objects, the speed of light is always constant regardless of an observer's reference frame.

与其他物体不同，无论观察者的系如何，光速始终是恒定的。

He talks about columnar reference frames and how he thinks that's one of the keys to understanding the brain.

他谈到了柱状架以及他是如何认架是理解大脑的关键之一。

Hey, I wasn't speeding—in my inertial reference frame.

嘿，我没有超速——在我的系中。

This would mean the earth is moving relative to an absolute reference frame.

这意味着地球正在相对于绝对系移动。

Well, we state the reference frame we're using.

好吧，我们声明我们正在使用的系。

Excuse me. If you were riding on the olive, you'd be in a non - inertial reference frame and would...Are you okay?

抱歉，如果你坐在那颗橄榄上，你就是一个非照系并会… … 你没事吧？

But when Stella changed her direction for the return journey, she entered a different reference frame from the one she'd started in.

但当史黛拉改变方向返程时，她输入的系与开始时的系不同。

The first says that the laws of physics are the same in all inertial reference frames.

第一个说物理定律在所有系中都是相同的。

This has to be true, because there's no real way to distinguish between reference frames.

这一定是真的，因没有真正的方法来区分系。

We do this by using units and frames of reference, which are also called reference frames.

我们通过使用单位和系（也称系）来做到这一点。

Time in that moving reference frame will seem to equal time in your reference frame, multiplied by gamma.

这个移动系中的时间似乎等于系中的时间乘以伽马。

Light always moves at the speed of light, though, no matter what your reference frame is.

无论您的系如何，光总是以光速移动。

You know, you can have two events that happen and two different people looking at it from two different what we call reference frames.

可以有两个事件发生两个不同的人身上、他们从两个不同的照系来观察它。

So time is slower in that moving reference frame.

因此，在那个移动的系中时间变慢了。

But when Stella changed her direction for the return journey, she entered a different reference frame from the one she’d started in.

但是当斯特拉改变她的返程方向时，她进入了一个与她开始时不同的照系。

We call this factor gamma, and it applies to any situation where another inertial reference frame is moving relative to yours.

我们将此称伽马因子，它适用于另一个系相对于您移动的任何情况。

And what do you think the speed of the truck is for the person using their blue car as the reference frame?

对于使用蓝色汽车作系的人来说，您认卡车的速度是多少？

In our train example, the two reference frames are the perspective of someone standing on the train, and someone standing on the platform.

在我们的火车示例中，两个照系分别是站在火车上的人和站在站台上的人的视角。

The only people who could notice time on the moving spaceship passing slower for Stella would be observers in an inertial, or non-accelerating, reference frame — like Terra back on Earth.

移动飞船上史黛拉的时间变慢了，唯一能觉察到这一点的人是在或非加速系中的观察者，譬如在地球上的特拉。

Time dilation occurs when another reference frame is moving relative to you, so time in that reference frame slows down relative to the time you measure.

当另一个系相对于您移动时会发生时间膨胀，因此系中的时间相对于您正在测量的时间会减慢。