interjection
noun formal uk/ˌɪn.təˈdʒek.ʃən/ us/ˌɪn.t̬ɚˈdʒek.ʃən/
[ C or U ]插话
an occasion when someone interrupts someone else, or the interruptions themselves
Her controversial speech was punctuated with noisy interjections from the audience. 她那颇有争议的演讲不时被听众嘈杂的插话打断。
[ C ] language specialized感叹词
a word that is used to show a short sudden expression of emotion
"Hey!" is an interjection. hey 是个感叹词。