irritation
/ˌɪɹɪˈteɪʃən/
noun
刺激、炎症
The act of exciting, or the condition of being excited to action, by stimulation; -- as, the condition of an organ of sense, when its nerve is affected by some external body; especially, the act of exciting muscle fibers to contraction, by artificial stimulation; as, the irritation of a motor nerve by electricity; also, the condition of a muscle and nerve, under such stimulation.
noun
刺激, 炎症
子供の絶え間ないそわそわと不平は、クラスメートに顕著な刺激を引き起こした。