来自 react,反应，反抗，-ive,形容词后缀。

1. Ozone is a highly reactive form of oxygen gas.

臭氧是一种非常活跃的氧气形态。

2. 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，多一些积极主动。

3. These reactive mole-cules are mopped up and made harmless by Vitamin E.

这些活性分子已被维生素E灭活，没有害处了。

4. 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。

5. In order to survive the competition a company should be proactive not reactive.

要在竞争中生存下来，公司不应该消极应变，而应当先发制人。