relative pitch

• 相对螺距

relative pitch的用法和样例：

例句

1. The horizontal anger has a variable pitch.
   横向搅龙具有可变的螺距。
2. When the helicopter is inverted, add enough negative pitch to support the helicopter, and remove the Aft cyclic control.
   当直升机到达最高点成为倒飞姿态时，增加负螺距使直升机的高度不会下降，将升降舵回到中立点。