1. Some people have very reactive skin and may experience irritation from certain products.
一些人皮肤非常敏感，可能会因为某些产品而感到刺激。
2. The substance is highly reactive and should be handled with caution.
这种物质具有很高的反应性，应该小心处理。
3. He has a reactive personality and tends to respond emotionally to any situation.
他的性格容易激动，对任何情况都有情绪化的反应。