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

与其他物体不同，无论观察者的参考系如何，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.

他谈到了柱状参考框架以及他是如何认为该框架是理解大脑的关键。

This reference frame is not an inertial reference frame.

这个参考系不是惯性参考系。

'Down' is an illusion of your reference frame.

“向下”是你的参照系的错觉。

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

嘿，我没有超速——在我的惯性参考系中。

To  earth's reference frame, gravity just pulls in.

对于地球参考系，是吸引。

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

这个移动参考系中的时间似乎等于参考系中的时间乘以伽马。

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，你就是个非惯性参照系并会… … 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，她输入的参考系与开始时的参考系不同。

In this reference frame this  block accelerates without a net, external force.

在这个参考系中，这个块体在没有净外的情况下加速。

So time is slower in that moving reference frame.

因此，在那个移动的参考系中时间变慢了。

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

好吧，我们声明我们正在使用的参考系。

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参考系（也称为参考系）来做到这点。

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

无论您的参考系如何，光总是以光速移动。

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

第个说物理定律在所有惯性参考系中都是相同的。

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

这定是真的，因为没有真正的方法来区分参考系。

Again, this is not an inertial reference frame, therefore, Newton's First Law does not hold true in this reference frame.

再者， 这不是个惯性参考系，因此， 牛顿第定律在这个参考系中不成立。

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、他们从两个不同的参照系来观察它。

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，它适用于另个惯性参考系相对于您移动的任何情况。

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，她进入了个与她开始时不同的参照系。