當且僅當 dāng qiě jǐn dāng

DEFINITIONS

  1. if and only if

CHARACTERS

當 dāng bear, accept, undertake; just
且 qiě
HSK 3
moreover, also (post-subject); about to, will soon (pre-verb)
僅 jǐn only, merely, solely, just
當 dāng bear, accept, undertake; just