Three Pass三轨法threenum.三n.三；三个adj.三个的three principal index systems三大检索系统three point stabilized reamer三点式稳定扩眼器three-dimensional rotations三维空间转动three diaphragm brake chamber三膜片制动分泵three figure decimal fraction[计] 三位十进制小数three-day's growth of beardthree-phase AC power source三相交流电源three tablets and two temples三碑二庙（祠）Three dimensional composition立体构成three-tipped cycloidal pump三尖摆线泵