beginning of ventricular ejection

例句：

1. 1. Thedoctor explained the beginning of ventricularejection to me.
   医生向我解释了心室射血的开始。
2. 2. Duringthe operation, the surgeonobserved the beginning of ventricular ejection.
   在手术过程中，外科医生观察到心室射血的开始。
3. 3. The patient's heart rate increasedas the beginning of ventricular ejection was detected.
   当检测到心室射血的开始时，患者的心率增加了。