defecation reflex

例句：

1. 1. The doctor advised him to take a rest after the surgery.
   医生建议他在手术后休息。
2. 2. The patient experienced a strong urge to defecate during the procedure.
   病人在手术过程中强烈地感到需要排便。
3. 3.The child's defecation reflex was triggered by the sudden movement.
   孩子的排便反射被突然的动作触发了。