threeleveladj.三级的threenum.三n.三；三个adj.三个的three methods of transmission三化three people basketball match三人篮球赛three tank alternating system三池交替工艺three coordinates measurement三坐标测量three dimensional coordinates三维坐标three-phase four core cable三相四芯电缆three transfer parallel robot三平移并联机器人three hundred and eighty nine(=389) 三百八十九three thousand and twenty one(=3021) 三千零二十一three point flexural strength三点弯曲强度