rotational speed的用法和樣例：
例句
- However, as spin speed is increased, the power required to overcome windage and bearing friction rises sharply.
但是，隨著自轉角速度的增加，克服風阻和軸承摩擦的功率急劇地提高。 - The result shows that during a fast flexion the short time average angular speed is nearly constant, but the instantaneous speed appears to be a fluctuation wave.
模擬結果表明，在快速屈曲過程中，食指短時平均角速度近似為勻速，瞬時角速度呈現阻尼振蕩形式。
