three pads三支撑掌threenum.三n.三；三个adj.三个的three-head milling machine三轴铣床three hundred and ninety two(=392) 三百九十二Three-Dimension Innovation三维创新three-dimensional textbook立体化教材Three- River's Source Areathree people make basketball三人制篮球three-in-one brake valve三合一制动阀three brace of partridges.三对鹧鸪。Three-axis tracking gimbal三轴跟踪架Three axis air bearing table三轴气浮台