An astronomical unit is the distance between Earth and our sun.
一个天文单位是地球与太阳之间的距离.
期刊摘选
One astronomical unit equals the distance from the earth to the sun.
一天文单位等于从地球到太阳的距离.
辞典例句
英英释义
Noun
1. a unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers)