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当且仅当 /dāngqiějǐndāng/ meaning in English

ChineseEnglish
当且仅当 /dāngqiějǐndāng/ conjunction

if and only if(implies and is implied by)
conjunction
[UK: ɪf ənd ˈəʊn.li ɪf] [US: ˈɪf ænd ˈoʊn.li ˈɪf]