唇齒相依

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

lip

variant of 唇[chun2]

lit. lips and teeth (idiom); fig. close partners / interdependent

tooth / CL:顆|颗[ke1]

each other / one another / mutually / fret on the neck of a pipa 琵琶[pi2 pa5] (a fret on the soundboard is called a 品[pin3])

appearance / portrait / picture / government minister / (physics) phase / (literary) to appraise (esp. by scrutinizing physical features) / to read sb's fortune (by physiognomy, palmistry etc)

to be interdependent

to depend on / to comply with or listen to sb / according to / in the light of