threemanadj.三人共同管理的threenum.三n.三；三个adj.三个的three party service三方通话业务three-second rule三秒规则three-course meal三道菜的一餐three calligraphies三笔字three-phase cable三相电缆Three-axis gimbal三轴跟踪架Three-piece bogie三大件转向架three-phase fault三相故障three-strikes law严惩惯犯法律three point problem三点问题,三标两角定位法