reflex act

例句：

1. 1.The scientist observed the animal's reflex reaction to the sudden noise.
   科学家观察到动物对突然噪音的反射反应。
2. 2. The child's reflex action saved his life.
   孩子的反射动作救了他的生命。
3. 3. The teacher noticed that the student's reflex action was delayed.
   老师注意到学生的反应动作延迟了。