moan [məʊn]

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n.呻吟声，悲叹声，抱怨声；v.呻吟，抱怨

to make a long low sound of pain , suffering or another strong emotion

From time to time there was a moan of pain from the sick man. 病人不时发出一声声痛苦的呻吟。
They moan on a lot about money. 他们对钱的事情抱怨不已。