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

与其他物体不同，无论观察者系如何，终是恒定。

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

他谈到了柱状框架以及他是如何认为该框架是理解大脑关键之一。

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

嘿，我没有超——在我惯性系中。

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，你就是一个非惯性照系并会… … 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，她输系与开时系不同。

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惯性系中都是相同。

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

这一定是真，因为没有真正方法来区分系。

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（也称为系）来做到这一点。

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

这个移动系中时间似乎等于系中时间乘以伽马。

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

无论您系如何，总是以移动。

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人身上、他们从两个不同照系来观察它。

So time is slower in that moving reference frame.

因此，在那个移动系中时间变慢了。

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返程方向时，她进了一个与她开时不同照系。

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

我们将此称为伽马因子，它适用于另一个惯性系相对于您移动任何情况。

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为系人来说，您认为卡车度是多少？

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

在我们火车示例中，两个照系分别是站在火车上人和站在站台上人视角。

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.

移动飞船上史黛拉时间变慢了，唯一能觉察到这一点人是在惯性或非加系中观察者，譬如在地球上特拉。

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，因此该系中时间相对于您正在测量时间会减慢。