根据《柯林斯英汉双解大词典 》：
ADJ Something that is reactive is able to react chemically with a lot of different substances. 活性的; 起化学作用的
ADJ If someone is reactive, they behave in response to what happens to them, rather than deciding in advance how they want to behave. 被动反应的; 回应性的 [usu v-link ADJ][1]
reactive power [化]无功功率
reactive power compensation 无功补偿
reactive dye 活性染料
reactive current 无功电流，电抗性电流
reactive dyeing 活性染料染色
reactive power control 无效功率控制
reactive diluent 活性稀释剂
reactive component [物]电抗成分；虚数部分；无功部分
reactive load 无功负载；电抗负载[1]
I want our organization to be less reactive and more proactive.
我希望我们的组织少一些被动反应，能够更加积极主动些。
The police presented a reactive rather than preventive strategy against crime.
警方对付犯罪的办法，不是事先加以防范，而是事后作出反应。
Ozone is a highly reactive form of oxygen gas.
臭氧是一种高度活跃的氧气形态。[1]