Three As三个自动化threenum.三n.三；三个adj.三个的three layersmodel三层模式three-point BVP三点边值问题Three layer model三层模型three party draft三方汇票three-level VSI三电平电压型逆变器three-bar curve三杆曲线three plate mould三板式模具three-day fever三日热Three prism curve三棱形three-dimension三维空间