The arm swing drived the thorax rotation to some extent.
手臂的摆动一定程度上带动了胸廓的旋转。
The cycle frequency of jet fluid swing is half of that of tangential circle rotation.
相应切圆呈周期性旋转，射流摆动也具有周期性，该周期是切圆旋转周期的一半。
End cover structure of the APS and 400 spring series is suitable for most of the rotation and swing seal.
端盖式结构的APS和400弹簧系列适用于大部分的旋转和摆动密封。
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