天文單位
參考資料

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↑  See, for example, the Merriam-Webster's Collegiate Dictionary, the American Heritage Dictionary, and the Oxford English Dictionary.
↑  International Astronomical Union (编),  (PDF), , Beijing, Kina: International Astronomical Union, 31 August 2012  [2017-03-15], （原始内容存档 (PDF)于2013-08-16）, The XXVIII General Assembly of International Astronomical Union recommends [adopted] that the astronomical unit be re-defined to be a conventional unit of length equal to exactly 7011149597870700000♠149597870700 metres, in agreement with the value adopted in IAU 2009 Resolution B2
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↑  astronomical unit （页面存档备份，存于） Merriam-Webster's Online Dictionary
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