单词light-year
na.: 【天】光年
光年（指光在一年中走过的距离：9.4607 × 10¹2 公里）:
the distance that light travels in one year, 9.4607 × 10¹2 kilometres
很长时间；很久:
a very long time
【天文学】光年
复数：light-years
Also visible, near the bottom of the image, is ten light-year long pillar sometimes dubbed the Fairy of Eagle Nebula .
此外，靠近影像底部有十根长度将近一光年的气柱，它们有时被戏称是老鹰星云的仙女。
Dreams seem always loom at the other side of the Galaxy, hundreds and thousands of light-year away from us. is that so far?
梦想永远是遥遥地偶尔出现在银河的那一端。那几万光年，真的是那么长、那么远么？
At present, the Earth has surrounded by a 50 light year-wide "shell" of radiation from analogue TV, radio and radar transmissions, he said.
他说，地球目前裹着一层由模拟电视、无线电和雷达传输辐射构成的50光年厚的外壳。
Within just a light-year of the black hole swarm more than 100, 000 other stars caught far more firmly in its grip.
仅在黑洞的一光年范围内就云集着另外十多万颗恒星，处在它更牢固的掌控之中。
One light year is the distance that light travels in a year.
一个光年是光在一年移动的距离。
One light year is the distance light will travel in a year, or about 6 trillion miles (10 trillion kilometers).
一光年是光在一年当中所能够穿行的距离，或者说大约相当于6万亿英里（10万亿公里）。
A light-year is the distance light travels in a year, or roughly 6 trillion miles (10 trillion kilometers).
光年是指光传播一年时间的距离，相当于10万亿公里（6万亿英里）。
Know astronomical unit and light year are used for expressing the distance between celestial bodies.
知道天文单位和光年是用来丈量天体之间距离的单位。
An approximately one-light-year tall "pillar" of cold hydrogen towers above the wall of the molecular cloud.
从分子云墙上耸立出来的一个大约1光年高的冷氢气柱。
light year , which is the distance traveled by light in one year . note that light year is a distance scale , not a time scale.
为量度单位，一光年是光在真空中行走一年的距离，紧记光年是距离单位而不是时间单位。