murmur的变形
vi.
低声说；含糊不清地说；咕哝：
The old man muttered to himself.
老人喃喃自语。
小声抱怨；发牢骚 (与against或at连用)：
She muttered against her husband.
她抱怨丈夫。
发出低沉的轰鸣：
They heard thunder muttering among the hills.
他们听见山中雷声隆隆。
vt.
低声说；喃喃地说；抱怨地说：
低声说；喃喃地说；抱怨地说：
The employee was