threeling三连晶threenum.三n.三；三个adj.三个的three dimensions nesting三维嵌套three- step iterations三重迭代three-hour range index三小时段指数Three-Gorges Reservoir三峡库区three-ray interference三射线干涉three terminal capacitor三端电容three dismensional tests三雏试验three order intermission三阶停歇three point bending beam三点弯曲梁three-bromine arsenazo三溴偶氮胂