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

 必要條件 [ㄅㄧˋ ㄧㄠˋ ㄊㄧㄠˊ ㄐㄧㄢˋ; bi4 yao4 tiao2 jian4]
 requirement
 necessary condition (math)