反之亦然

fǎnzhīyìrán
vice versa

CEDICT

vice versa; the other way round

Wiktionary

Entry Composition

1 反之 fǎnzhī
  1. on the other hand...
  2. conversely...
2 亦然 yìrán
  1. (literary) to be also the case; to be similar; to be likewise
  2. to be also the case; to be similar; to be likewise