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。
The cycle frequency of jet fluid swing is half of that of tangential circle rotation.
表面波的影响使得射流轴线扭曲摆动，加强了射流与周围水体的动量交换。
The interaction between jets and linear waves make the jets swing; and make the momentum exchange strongly between the jets and the water around the jets.
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