Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Blood Flow Examples

血液流动示例
Poiseuille's law gives insight into the complex task of regulating blood flow to different parts of the body. In response to demand, the body must direct more oxygen and nutrients to one region of the body, and if necessary temporarily curtail the supply to a less essential region. Since the flow resistance depends upon the fourth power to the interior radius of a vessel, the processes of vasodilation and vasoconstriction offer powerful control mechanisms.
If there is a need to increase the blood flow through a given vessel by percent, or to x its original value, then vasodilation by percent or to x its original radius will accomplish the increase. This assumes that the applied pressure remains the same.

The effect of vessel radius is just as dramatic in reduction. A reduction the the interior radius of a vessel by percent or to x its original radius will reduce the flow by percent, or to x its original value.
泊肃叶定律为调节血液流向身体不同部位的复杂任务提供了见解。当有需求时，身体必须将更多的氧气和营养物质输送至某一区域，必要时暂时减少对不那么重要的区域的供应。由于流体阻力与血管内径的四次方成正比，血管扩张和收缩提供了强大的调控机制。如果需要使某一血管的血流增加百分之多少，或达到原来的x倍，那么通过使血管半径增加百分之多少或达到原来的x倍即可实现这一增加。这假设施加的压力保持不变。血管半径的影响在减少时同样显著。如果血管内径减少百分之多少或达到原来的x倍，那么血流将减少百分之多少或达到原来的x倍。
中文译文中的待填/计算数值依次对应：1：fp 2：ff 3：rp 4：rf 5：rp2 6：rf2 7：fp2 8：ff2。实际数值以上方原输入框为准。
 Index

Poiseuille's law concepts
索引 埃奥菲定律概念
 
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