reactive
/rɪˈæktɪv/adjective
1- 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。
1.1
- 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.
主动出击而非应式的方法。
1.2
- 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。
1.3
- Physiology showing an immune response to a specific antigen【生理】对抗原有免疫反应的。
1.4
- (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。
1.5
- Physics of or relating to reactance【物理】电抗性的, 无功的：
a reactive load.
电抗性负荷。