light-year
UK/'laitjə:/US
释义
n.
The distance light travels in one year, used to measure astronomical distance
光年（距离单位）
n.
(informal) a very great distance or degree of difference
（非正式）极大的差距；天壤之别
词根拆分
原生英语light（光）+ year（年）= 光在一年里走过的距离。常见陷阱：听起来像时间单位，其实量的是距离，不是时长。非正式说 light-years ahead 就是「领先一大截」。light 取光义。
词根 light 还连着 58 个词常用搭配
- 1.several light-years away相隔若干光年
- 2.light-years apart相距光年之遥
例句
- 1.
The nearest star is about four light-years from Earth.
离地球最近的恒星大约有四光年远。
- 2.
Their technology is light-years ahead of ours.
他们的技术领先我们一大截。