单词：triads
音标：[ˈtraiədz] ；
n. 三个一组, 三幅一组, 三和音( triad的复数形式 )
n. the cardinal number that is the sum of one and one and one
n. a set of three similar things considered as a unit
n. three people considered as a unit
n. a set of three similar things considered as a unit
n. three people considered as a unit