threedoors三门冰箱threenum.三n.三；三个adj.三个的three-phase synchronous machines三相同步发电机Three-Plunger Reciprocating Pump三柱塞往复泵three people's principles republicthree-coupled precision assembly精密偶件three thousand two hundred and six(=3206) 三千二百零六three-dimensional film electrode三维膜电极three-phase bridge rectification三相桥式整流Three Gorges Navigation Structures三峡通航建筑物three -dimensional teaching goal三维教学目标three-strand double cross-over三股双交换