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From: MDBG CC-CEDICT Chinese-English Dictionary 漢英字典

 天文單位 [ㄊㄧㄢ ㄨㄣˊ ㄉㄢ ㄨㄟˋ; tian1 wen2 dan1 wei4]
 Astronomical Unit
 AU
 149,567,892 km