grumbling [ˈgrʌmblɪŋ]

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附加级

adj. 喃喃鸣不平的, 出怨言的

She's always grumbling to me about how badly she's treated at work. 她总是向我抱怨她在工作中如何受亏待。
We didn't hear any grumbling about the food. 我们没听到过对食物的抱怨。