Frequency of uterine contraction

• 子宫收缩频率

Frequency of uterine contraction的用法和样例：

例句

1. 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。