interjection · an exclamation expressing surprise, wonder, or shock

哎呦，这衣服可真漂亮！

interjection · an exclamation expressing sudden physical pain

哎呦，你踩到我的脚了！

interjection · an exclamation expressing annoyance, dismay, or the realization of a mistake

哎呦，我把手机忘在家里了。