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当且仅当
當且僅當
dāngqiějǐndāng
1. if and only if

Character Breakdown

当
dāng
appropriate, timely; to act, to serve; the sound of bells
HSK 3 6 丶
且
qiě
moreover, also (post-subject); about to, will soon (pre-verb)
HSK 3 5 丶
仅
jǐn
only, merely, solely, just
HSK 4 4 丶
当
dāng
appropriate, timely; to act, to serve; the sound of bells
HSK 3 6 丶

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