three pair三对threenum.三n.三；三个adj.三个的three-fourths value clause四分之三价值条款three-dimensional isolator三维隔震支座Three - River Water System“三江”水系three system of temperaments三种律制three dimensional ruralissue三农问题three lever computer network三级计算机网络three-dimensional gas flow三维流动Three'way catalyst converterthree-lobe journal bearing三油楔固定瓦滑动轴承three-phase stepping motor三相步进电机