threefoleadj.三倍;增加二倍;三重的;三方面的;三次adv.三倍;增加二倍;三重地;三方面的;三次
threenum.三n.三;三个adj.三个的
three-domain system三域体系
three-curve theorem三曲线定理
three-abreast seats三人并肩座椅
three dimension sound三维声音
three-hole aperture三孔光栏
Three level faltering三层过滤
three-cylinder pump三缸泵
three-centered bond三中心键, 三中心结合键
three-centered arch三心平圆拱; 三心拱
three point arbitrage三角套汇