helical rake angle

例句：

1. 1. The helical rake angleof the screw is crucial for its function.
   螺丝的螺旋形锯齿角度对其功能至关重要。
2. 2. The helical rake angleof the gears can affect the efficiencyof the machine.
   齿轮的螺旋形锯齿角度会影响机器的效率。
3. 3. The helical rake angleof the blades can beadjusted to optimize cutting performance.
   刀片的螺旋形锯齿角度可以调整以优化切割性能。