interjection · a nonverbal grunt used to express agreement, affirmation, or acknowledgment

嗯，我会准时到的。

interjection · an interjection used to express hesitation, thinking, or pondering while speaking.

嗯，我们有事情要宣布吗？

interjection · a nonverbal grunt used to express surprise, doubt, or to ask for clarification

嗯？你刚才说什么？

interjection · Interjection indicating approval, appreciation, or agreement

嗯，你说得对。

onomatopoeia · a groaning sound

他疼得嗯了一声。