three no三不穿(不戴乳罩、不系袜带、不穿三角裤衩)threenum.三n.三；三个adj.三个的three-level tree三级树three-ary matrix三元阵three dictionaries三书three plane shafts三面轴three-coordinate三坐标three-ball match三球赛three cube network三立方体网络three way catalyst三元催化器three-mode laser三模激光器three-phase soil三相土