threemanadj.三人共同管理的threenum.三n.三；三个adj.三个的three couple waves三波耦合three elastic axes三弹性轴three-pipe tower三管塔three body problem三体问题three electro tube三极管three-point test三点测验, 三点测交three propositions三个命题three-member cog三角垛式支架three-pit system三槽法three-way switch三路开关