The distance from the sun to earth is one astronomical unit.
太阳到地球的距离即为一个天文单位。
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。
One astronomical unit is the distance between the Earth and the sun.
一个天文单位等于地球到太阳之间的距离。
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。
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