“你完成作业了吗？”“嗯哼，”他头也不抬地回答。

"Did you finish your homework?" "___Uh huh," he replied without looking up.

我一边听妈妈讲话，一边点头说“嗯嗯”表示我在听。

I nodded and said "___uh huh" while listening to my mom talk.