相輔相成

相辅相成
xiāngfǔxiāngchéng
(idiom) to complement one another

CEDICT

Entry Composition

1 相 xiāng
  1. each other
  2. one another
  3. mutually
  4. fret on the neck of a pipa 琵琶 pípa (a fret on the soundboard is called a 品 pǐn)
2 輔 fǔ
  1. to assist
  2. to complement
  3. auxiliary
3 相 xiāng
  1. each other
  2. one another
  3. mutually
  4. fret on the neck of a pipa 琵琶 pípa (a fret on the soundboard is called a 品 pǐn)
4 成 chéng
  1. to succeed
  2. to finish
  3. to complete
  4. to accomplish
  5. to become
  6. to turn into
  7. to be all right
  8. OK!
  9. one tenth