"he grumbled a rude response" "Stones grumbled down the cliff"
The guard growled out a warning, threatening the prisoners with his gun.
看守吼了一声警告,并用枪威胁囚犯们。
The bear..turned, reared, showed his teeth, and growled.
牛津高阶第八版
美国韦氏词典
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维基百科 (自由的百科全书)