当且仅当當且僅當

dāng qiě jǐn dāng

释义

if and only if

在应用里学习 → 按笔顺书写

汉字

当dāngappropriate, timely; to act, to serve; the sound of bells⺌彐且qiěmoreover, also (post-subject); about to, will soon (pre-verb)月一仅jǐnonly, merely, solely, just亻又