showing a response to a stimulus 反应(性)的;对刺激反应灵敏的 pupils are reactive to light. 瞳孔对光反应灵敏。 ■acting in response to a situation rather than creating or controlling it 反作用的,反动的 a proactive rather than a reactive approach. 主动出去而非应式的方法。 ■having a tendency to react chemically 易起化学反应的,化学性质活泼的,活性的;化学反应的 nitrogen dioxide is a highly reactive gas. 二氧化氮是易起化学反应的气体。 ■(Physiology)showing an immune response to a specific antigen (生理)对抗原有免疫反应的 ■(of a disease or illness) caused by a reaction to something (疾病,不适)由过敏反应引起的 reactive arthritis. 过敏性关节炎。 reactive depression. 过敏性抑郁症。 ■(Physics)of or relating to reactance (物理)电抗性的,无功的 a reactive load. 电抗性负荷。