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.

他谈到了柱状考框架以及他是如何认为该框架是理解大脑关键之一。

This reference frame is not an inertial reference frame.

这个考系不是惯性考系。

'Down' is an illusion of your reference frame.

“向下”是你系错觉。

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

，没有超速——在惯性考系中。

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

对于地球考系，重力只是吸引。

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

这个移动考系中时间似乎等于考系中时间乘以伽马。

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，你就是一个非惯性系并会… … 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，她输入考系与开始时考系不同。

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

在这个考系中，这个块体在没有净外力情况下加速。

So time is slower in that moving reference frame.

因此，在那个移动考系中时间变慢了。

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

好吧，们声明们正在使用考系。

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

们通过使用单位和考系（也称为考系）来做到这一点。

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

无论您考系如何，光总是以光速移动。

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

第一个说物理定律在所有惯性考系中都是相同。

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， 这不是一个惯性考系，因此， 牛顿第一定律在这个考系中不成立。

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人身上、他们从两个不同系来观察它。

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

们将此称为伽马因子，它适用于另一个惯性考系相对于您移动任何情况。

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返程方向时，她进入了一个与她开始时不同系。