1. a bit or drill having deep helical grooves. 
   有深螺旋状凹槽的一种钻头或钻井。
2. the raised helical rib going around a screw. 
   绕着螺丝的凸起的螺旋状的肋纹。
3. flying downward in a helical path with a large radius. 
   在大的范围内以螺旋的路径向下飞。
4. The helical gear has become worked down over the years. 
   斜齿轮因为年久而磨损了。
5. a balance that measure weight by the tension on a helical spring. 
   在螺旋状的弹簧上依靠拉力称物体重量的秤。

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• 1. 螺距
  half-standard-pitch auger 半标准螺距螺旋...helical pitch 螺距...hydraulic pitch control system 液压螺距操纵系统
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