Many pesticides are irritants.

许多杀虫剂都有刺激性。

Chemical irritants in the workplace.

工作场所的化学刺激物。

occupational dusts and chemicals (vapors, irritants, and fumes);

职业灰尘和化学品（蒸汽、刺激物和烟雾）；

They are, however, skin irritants and require careful handling.

然而，他们是皮肤刺激和需要小心处理。

Acute bronchitis can be caused by infection or by exposure to irritants.

急性支气管炎是由感染或接触刺激物引起。