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  1. Oxford Dictionary

    astronomical unit

    英式

    • n.
      a unit of measurement equal to 149.6 million kilometres, the mean distance from the centre of the earth to the centre of the sun.

    • noun: astronomical unit, plural noun: astronomical units

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    astronomical unit

    • IPA[ˌastrəˈnäməkəl ˈyo͞onət]

    美式

    • n.
      a unit of measurement equal to 149.6 million kilometers, the mean distance from the center of ...

    Oxford American Dictionary