hyperboloidal gear英美双曲面齿轮;歪伞齿轮机械双语例句Two-side horizontal boring transfer machine hyperboloidal gear双面卧式镗孔组合机床双伞齿轮,双曲面齿轮Optimum Design of Circular Tooth Hyperboloidal Gear for Noise Reduction圆弧齿双曲面齿轮降低噪声的优化设计