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

 等差級數 [ㄉㄥˇ ㄔㄚ ㄐㄧˊ ㄕㄨˋ; deng3 cha1 ji2 shu4]
 arithmetic series (such as 2+4+6+8+...)