irritation

n. 刺激,烦恼,刺激物

The traffic noise is a constant irritation to city dwellers.

车辆的噪音对城市居民是永无止境的骚扰。

A localized protective reaction of tissue to irritation, injury, or infection, characterized by pain, redness, swelling, and sometimes loss of function.

发炎动物组织针对外界刺激、伤害、感染的一种固定保护性发应，表现为疼痛、发红、肿大，有时丧失功能