光年;
词源词根法
长度单位,光跑一年的距离。
And one light year is the distance that light travels in a year.
和一架轻型今年是距离光在一年.
And one light year is the distance that light travels in a year . 1.
一光年就是光在一年中传播的距离.
The distance travelled by light in one year is called a light year.
光在一年内行经的距离称作1光年.
The distance traveled by light in one year is called a light year.
一光年的距离大得令人难以想象.
Do you know the light year?
你知道光年 吗 ?
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