The trace showed a normal heart rhythm.

描记图表明心率正常。

《牛津词典》

A normal heart has a smooth lining, making it difficult for bacteria to stick to it.

正常心脏有平滑的内膜，使细菌很难在上面附着。

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In the secular world, can learn to use a normal heart to treat all around, is also a kind of realm.

在这个纷绕的世俗世界里，能够学会用一颗平常的心去对待周围的一切，也是一种境界。

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If a heart beats too slowly, the device will use electrical signals to help set a normal rate.

VOA: special.2010.06.29

If they're having a coronary artery bypass or they're having a heart transplant, then there's some period at which their normal heart - their heart is stopped and this machine assumes the functions of their heart.

病人在做冠状动脉搭桥手术,或者心脏移植手术时,病人自己的心脏,会停跳一段时间,而这台设备就能代替心脏工作

耶鲁公开课 - 生物医学工程探索课程节选

If a heart beats too slowly, the pacemaker will use electrical signals to help set a normal rate.

VOA: special.2010.06.02

Their team showed that the device could generate 18 times the amount of energy needed to power a pacemaker using a normal heart beat, according to Dr. Karami.

WSJ: Harnessing Energy From the Body to Power Devices

Patients who have a slower than normal heart rate or are already taking drugs to treat arrhythmias should also be cautious.

CNN: FDA: Popular antibiotic can cause fatal heart rhythms

Work by Dr. Gershon and others has shown that serotonin is necessary for the repair of cells in the liver and lungs, and plays a role in normal heart development and bone-mass accumulation.

WSJ: A Gut Check for Many Ailments