murmur [ˈmɜ:mə(r)]

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n.低语，低声的怨言；vi.低语，低声而言；vt.低声说

to speak or say very quietly

They paid the extra taxes without a murmur. 他们毫无怨言地交了附加税。
There was a low murmur of conversation in the hall. 大厅里有窃窃私语声。