然而，在粒间孔发育的岩石中，流体必须在颗粒周围的曲折通道中流动；而这种曲折通道会对其流动产生阻力。

In the intergranular spaces of rocks, however, fluid must flow around and between grains in a tortuous path; this winding path causes a resistance to flow.

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如果流体是往外流动的，那它将会占据越来越多的空间。

If we mention this fluid flowing out there, it is occupying more and more space.

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事实上，流体的流动——尤其是模仿心脏跳动效果的脉冲——对在实验室培育人造动脉是至关重要的。

In fact, fluid flow - particularly pulses that mimic the effect of a beating heart - is proving crucial for growing replacement arteries in the laboratory.

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