在实验室里，当海豹潜入到水面以下并停止呼吸时，它的心脏跳动得更慢，需要的氧气更少，动脉也会收缩。

In the laboratory, when the seal dives below the surface of the water and stops breathing, its heart beats more slowly, requiring less oxygen, and its arteries become constricted.

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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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