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

 保長對應 [ㄅㄠˇ ㄔㄤˊ ㄉㄨㄟˋ ㄧㄥˋ; bao3 chang2 dui4 ying4]
 (math.) a distance-preserving correspondence
 an isometry
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