contraction of heart

• 心脏收缩

contraction of heart的用法和样例：

例句

1. As the heart falters, the body releases adrenaline to keep the organ pumping.
   例如心颤患者，体内释放的肾腺上素能保持心脏收缩力。
2. One set of wires tells the pacemaker what the heart's contraction rate is.Another set of wires tells the heart to contract if the rate is too slow or too erratic.
   一组导线告诉心脏的收缩频率，另一组导线在心率太慢或不稳定时让心脏收缩。