互相监督

mutual supervision

mutual

each other / mutually / mutual

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 supervise / to inspect / jail / prison

supervisor

to control / to supervise / to inspect

to supervise and direct / army title (archaic)

(bound form) to supervise