可调螺距,活螺距

adjustable pitch的用法和样例：

例句

The horizontal anger has a variable pitch.横向搅龙具有可变的螺距。
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。

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