control rate的用法和樣例：
例句
- In order to control speed, the pulley needs to be continually spinning.
為了控制速度，滑輪必須連續旋轉。 - The purpose is to enrich the control mode of aerocraft, to lighten the pilot handling intensity, to improve manipulative speed and security.
研究目的是豐富飛行器控制方式，減輕飛行員操作強度，提高控制速度和安全性能。
