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

与其他物体不，无论观察者参考系如何，光速始终是恒定。

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

他谈到了柱状参考框架以及他是如何认为该框架是理解大脑关键之一。

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，她参考系与开始时参考系不。

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，如果你颗橄榄上，你就是一个非惯性参照系并会… … 你没事吧？

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

嘿，我没有超速——我惯性参考系中。

'Down' is an illusion of your reference frame.

“向下”是你参照系错觉。

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

对于地球参考系，重力只是吸引。

This reference frame is not an inertial reference frame.

这个参考系不是惯性参考系。

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

无论您参考系如何，光总是以光速移动。

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）来做到这一点。

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

这个参考系中，这个块体没有净外力情况下加速。

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

这个移动参考系中时间似乎等于参考系中时间乘以伽马。

So time is slower in that moving reference frame.

因此，个移动参考系中时间变慢了。

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

好吧，我们声明我们正使用参考系。

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人身上、他们从两个不参照系来观察它。

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

第一个说物理定律所有惯性参考系中都是相。

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参考系。

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参考系相对于您移动任何情况。

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

再者， 这不是一个惯性参考系，因此， 牛顿第一定律这个参考系中不成立。

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，她进了一个与她开始时不参照系。