rotational

The length refers to the length of the arm; because the throwing motion is rotational from the shoulder out, the atlatl simply lengthens the arm to increase the throwing speed and force..长度是指胳膊长度，因为抛扔运动是以肩膀关节为中心的旋转运动，这样一来，飞镖投掷器只不过是手臂的延长，因此，增加了投掷的速度和力量。

rotational speed,旋转速度，角速度；圆周速度

rotational grazing,循环放牧

rotational inertia,转动惯量；转动惯性；惯性矩

rotational flow,旋流

rotational molding,旋转模塑；旋转成型

rotational velocity,自转速度；转动速度；围速

rotational motion,回转运动；转动运动

rotational symmetry,旋转对称；轴对称

rotational movement,转体动作