noise equivalent angle 噪声当量角
noise angle 噪声角
angle tracking noise 角追踪杂音 ; 角度跟踪噪声
angle e noise 角度噪声
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.
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 level of noise we hear also depends on the Angle and distance of the shell from the ear.
我们听到声音的大小同时也取决于贝壳与耳朵的角度及距离。
Air compressor noise is the main noise source. From the Angle of air flow noise, can be briefly analyzes the following.
气流噪音是空压机的主要噪声源。从气流噪声的角度，可以简要分析如下。
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