... rotational center；旋转中心 rotational direction；旋转方向 rotational movement；旋转运动 ...
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reverse rotational direction 逆旋转方向
direct rotational direction 正旋转方向
The frame is suspended in such a way that its motion is severely restricted in all but the rotational direction.
该框架以这样的方式悬挂，使其除旋转方向之外沿所有方向的运动被严格地限制。
And molded-in arrows on top of the handle dictate rotational direction to personnel for easy operation within 90o stops.
手柄上模铸的箭头表示旋转方向，方便操作人员在90o角度范围内进行操作。
And the winding structure of a longer quiet filament may exist, the motion of the filament is comparatively complex and the rotational direction alters along the axis.
而较长的宁静型暗条可能存在着缠绕结构，其运动较为复杂，旋转方向沿轴向发生变化。
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