threepoleadj.三极式的threenum.三n.三；三个adj.三个的Three-mirror anastigmat三反射系统three-network-merging三网融合three ups and three downs三起三落Three-line Construction三线建设three-component balance三分力天平Three dimension expansion2维膨胀效应three fatal constitutions三大构成three-colour television三色电视three-tier C/S model三层C／S模型three-tank level system三容系统