interjection

“哎哟！”是一个表达疼痛的感叹词。

"Ouch!" is an ___interjection that expresses pain.

当老师讲解时，一个学生突然喊出“我不明白”打断了课堂。

A student suddenly yelled 'I don't understand!' as an ___interjection during the teacher's explanation.