threenum.三n.三；三个adj.三个的threestepadj.三级的threeling三连晶three R's背环threepoleadj.三极式的three stepadj.三级的three less三无西服(无后背、无前襟、无两胁)three yins三阴threepiecen.三件一套的threephaseadj.三相的n.三相three core三心