唇齿相依 chún chǐ xiāng yī

DEFINITIONS

  1. lit. as close as lips and teeth (idiom); closely related
  2. interdependent

CHARACTERS

唇 chún
HSK 6
lips
齿 chǐ
HSK 5
teeth; gears, cogs; age; simplified form of the KangXi radical number 211
相 xiāng
HSK 3
mutual, reciprocal, each other
依 yī
HSK 5
rely on, be set in; consent, obey a wish