the amount of time it takes for a person or system to respond to something With slower reaction times, drivers are less able to take action in response to sudden hazards. 由于反应时间较慢，因此驾驶员应对突发危险采取行动的能力降低。 Reaction time is typically slowed after concussion. 脑震荡后反应时间通常会减慢。 Touch screen reaction time can be a little sluggish. 触摸屏的反应时间可能会有所延迟。