反应英语是reaction。
例句：
1、据称一些患者有这种反应。
This reaction has been reported anecdotally by a number of patients.
2、人们对这部影片的反应大不一样。
People's reaction to the film has varied greatly.
3、对她获任命为主管一事，人们的反应褒贬不一。
There has been a mixed reaction to her appointment as director.
4、她敌视的反应使我们大吃一惊。
We were rather taken aback by her hostile reaction.
5、她正在承受着冲击所带来的滞后反应。
She's suffering a delayed reaction to the shock.