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