1640s, "to exert, as a thing acted upon, an opposite action upon the agent," from re- + act (v.). Chemical sense is from 1944. Related: Reacted; reacting (1610s). For sense development, see reaction. Meaning "perform again" (often re-act) is from 1650s.
实用例句
1. There'dbe no telling how John would react to such news as this.
还不知道约翰听到这样的消息会作何反应。来自柯林斯例句
2. I don't react anymore when opponents try to niggle me.
对手找茬惹我时，我不会再理他们。来自柯林斯例句
3. Someone allergic to milk is likely to react to cheese.
对牛奶过敏的人可能对奶酪也有不良反应。来自柯林斯例句
4. Peonies react badly to being moved and are best left undisturbed.
