That's the distance light travels in a year.

即光在一年内走过的距离。

A light year is the distance light travels in a year, about 9.5 trillion kilometers.

光年指光在一年中行进的距离，约为9.5万亿公里。

A light year is the distance light travels in one year, about nine trillion kilometers.

一光年是光在一年内传播的距离，大约9万亿公里。

One light year is the distance light travels in a year.

一光年是光在一年中传播的距离。

A light year is the distance light travels in a year – about 9.5 trillion kilometers.

一光年是光在一年中传播的距离，大约9.5万亿公里。

A light year is the distance light travels in a year.

一光年是光在一年中传播的距离。

The scale here is the Planck length, which is the distance light travels in a Planck Time.

这里的尺度是普朗克长度，表示光在一普朗克时间所传播的距离。

A light year is the distance light travels in one year.

一光年是光在一年中传播的距离。

A light year is the distance light travels in a year, which is equal to about 9.5 trillion kilometers.

一光年是光在一年中传播的距离，约等于9.5万亿公里。

A light-year is the distance light travels in a year, 9.5 trillion kilometers.

一光年是光在一年中传播的距离，9。5万亿公里。

Since a light year is exactly the distance light can travel in a year, Stella's journey should take 23 years.

1 光年指光在一年中传播的距离，所以史黛拉的旅程应该是 23 年。

The amount of distance light can travel in a year.

光一年可以传播的距离。

Imagine a gun shooting a light tank a distance of 47 kilometers and you'll begin to understand the power behind it.

想象一下，一支枪在 47 公里外射击一辆轻型坦克，你就会开始理解它背后的力量有多大了。

This square is 10 to the 16 metres, the distance light travels in one year, one light year.

这个正方形是十到十六米，光走一年的距离， 一光年。

Seawater is very slightly opaque, meaning that over a long enough distance, light is  absorbed and will not reach the far point.

海水非常不透明， 这意味着在足够长的距离内，光会被吸收， 无法到达远处。

The entire carcass of a deer was roasting before a large fire, which threw its light a long distance among the trees under which they were assembled.

一头鹿的整个尸体在大火前烤着，火光把它们聚集在树下很远。