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

 充要條件 [ㄔㄨㄥ ㄧㄠˋ ㄊㄧㄠˊ ㄐㄧㄢˋ; chong1 yao4 tiao2 jian4]
 necessary and sufficient condition