three Rsph.threenum.三n.三；三个adj.三个的three wheel roller三滚筒压路机three independence三自主教学three-door house三车消防站three-high berth三层床three-point gait三点步态three-way signal三面信号three-edged rule三棱尺three-level atom三能级原子three continuously三个不断线Three cubed Bezier三次贝塞尔曲线