我问他是否同意我的计划，他只是轻声说了句“嗯”。

When I asked if he agreed with my plan, he just softly said '___mmm-hmmm'.

她思考了一会儿，发出“嗯嗯”的声音，然后才给出建议。

She paused with a thoughtful '___mmm-hmmm' before offering her advice.