... 夹角 included angle; 桨叶夹角; angle between oars 极位夹角 Crank angle between extreme positions ...
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桨叶夹角
Blade Angle
以上为机器翻译结果，长、整句建议使用 人工翻译 。
要降低噪音，最简单的方法是增大旋翼桨叶的夹角，也叫“节距”，或是降低转速。
The simplest way to dampen a helicopter's noise is to increase the Angle of the rotor's blades, also called the pitch, and slow them down.
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