Interjections in Daily English: Choosing, Punctuating, and Hearing Everyday Reactions
先写下记得的内容，再查看解释。不要填写个人信息。
查看解释
An interjection is a sound, single word, or brief phrase that expresses an immediate reaction or emotion. It does not connect grammatically to subject-verb structures, and its spelling remains identical regardless of tense, person, or quantity.
Ouch, this wooden splinter got caught in my thumb.