Veins are flexible and can get twisted, slowing the rate of blood flow and potentially leaving waste and compounds such as iron to accumulate in the brain.
静脉是有弹性的，并且是能够扭曲的，它能够降低血液流速，潜在地运出代谢废物和化合物，比如脑中所集聚的（废）铁物质。
The results show that the axial speed of the flow and the half-pitch of the twisted tape are the important factors to the rotating speed of the self-rotating twisted tape.
理论分析及实验结果均表明，影响换热管内自旋扭带转速的主要因素是流体轴向流速及扭带半扭距。
By the kinematic analysis of flow, and the analysis of drive moment and resistance moment, the rotating speed expression of self-rotating twisted tape was deduced.
通过对换热管内流体的运动分析和自旋扭带的转动力矩与阻力矩分析，推导出扭带的转速计算式。
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