A pitch controller rotates each blade around a bearing, setting it to the best angle for the wind speed.

同时间距控制装置会根据风速旋转安装在轴承上的风叶，保持在最佳角度。

youdao

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。

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The main blades pitch Angle is controlled by the up and down movements of the swashplate.

大桨的螺距角度是由倾斜盘的上升和下降动作控制的。

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Previously we were able to sit comfortably in seats that could recline at an angle of 45 degrees, with a pitch of something like 3 feet between seats.

BBC: News Online

When the device first launched in 2002, Angle brought a box of Cheerios to retailer pitch meetings.

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