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1.The demand pacemaker is designed to regulate the flow of blood in the body.
需求调节器旨在调节体内血液流动。
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2.The demand pacemaker was a revolutionary device that improved patient outcomes.
需求调节器是一种革命性的设备，提高了患者的治疗效果。
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3. The demand pacemaker was a life-saving device for patients with heart failure.
需求调节器是患有心脏病患者的生命救星。