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The mouth (口) expresses a sound of agreement or hesitation, while the heart (心) feels it — to hum in thought or assent.
Download and print worksheets to practice writing 嗯

Real-world example sentences demonstrating how 嗯 is used in context
Yeah, I understand.
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Yeah, I'll take care of this right away.
Hmm, let me think about this question.
Uh-huh, I understand what you mean.