A light year is a unit measuring the distance that light travels in one year - around 6 trillion miles.

一光年“a light year”指光在一年中传播的距离，是大约6万亿英里。

" I think I could jump over it, " said the Cowardly Lion, after measuring the distance carefully in his mind.

胆小的狮子，在它仔细地估计好了壕沟的宽度后说：“我想我可以跳过去的。”

We use this with measuring something, so eyesight is - you're measuring the distance of things with your eyes, and like - oh, it's off.

我们用它来测量东西， 所以视力是——你用眼睛测量物体的距离，就像——哦， 它关了。

When you do the math, you find that measuring the distances to the other planets means you need to know the distance from the Earth to the Sun accurately.

当你计算时，你会发现测量到其他行星的距离意味着你需要准确地知道从地球到太阳的距离。

Astronomers talk about light years in measuring distance in space, and that's what Dad is referring to, how long it would take to get from, say, one part of the universe to another.

天文学家在测量空间距离时谈论光年，这就是爸爸所指的，从宇宙的一部分到另一部分需要多长时间。