threefoldadj.三倍的;三重的adv.三倍地;三重地
threenum.三n.三;三个adj.三个的
three major fertilizer三要素肥料
three terminal contact三端子触点
three-legged support三脚支架
threedimensional model三维模型
three dimensional data三维数据
three-wheeled mopeds三轮两用车
three-finger emitter三指发射极
three/double thread3/2线形
three-axis machining3轴NC加工
three lines of defence三道防线