threeleveladj.三级的threenum.三n.三；三个adj.三个的Three - dimensional terrain三维地形three point near-bit reamer三点式近钻头扩眼器three-electrode vacuum tube三级真空管three well-defined horizons三个具限分明的土层three phase seven wire system三相七线制three hundred and eighty four(=384) 三百八十四three dimensional model build三维建模Three-dimensional vibration三维振动three principles of adherence三贴近原则three phases and five columns三相五柱式