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3.144.16.151

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

 等差數列 [ㄉㄥˇ ㄔㄚ ㄕㄨˋ ㄌㄧㄝˋ; deng3 cha1 shu4 lie4]
 arithmetic progression