Three-three-two pattern
Chord of the four-three
Double augmented six-four-three chord
three-five compound (III-V compound)
Cooperation of Five-Rule
three-throw turnout；symmetrical three throw turnout；three-way turnout
AC three phase three wire insulated system
AC three phase three wire system with earthed hull as neutral wire
alternating current three phase three wire insulated system
alternating current three phase three wire system with earthed hull as neutral wire
network model of three-level three-network dual-mode
TDTW Three Dimensional Three Wire
Three Arguments on Three Gong in One Yun