在液体的流动空间任意画一不属流线的封闭曲线，由这些流线组合的表面称为流管，流管内的流线群称为流束。
n. fillet
misc. stream tube
流束存在碰撞时，负能性质改变为负耗散性质。
When the stream is collisional, the negative energy nature changes to negative dissipative nature.
观察30例显示血流会聚区（FCR）的偏心性二尖瓣返流患者的返流束形态，发现均为附壁细长束。
The shape of regurgitant jets in 30 patients with eccentric mitral regurgitation showing now convergence region (FCR) was observed.
于左心长轴观、心尖或胸骨旁四腔观以及反流束横断面方位显示偏心性反流束的整体形态，评价二尖瓣的反流程度。
Its stereoscopic shape was observed in long views, the apical and parasternal four chamber views of left ventriculum and its regurgitant extent were estimated.
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