relative pitch的用法和樣例：
例句
- The horizontal anger has a variable pitch.
橫向攪龍具有可變的螺距。 - When the helicopter is inverted, add enough negative pitch to support the helicopter, and remove the Aft cyclic control.
當直升機到達最高點(diǎn)成為倒飛姿態(tài)時(shí)，增加負螺距使直升機的高度不會(huì )下降，將升降舵回到中立點(diǎn)。
