动词
中文翻译：低语
同义词：
['murmur', 'murmur']
例句：
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1.She muttered under her breath as she walked away.
她边走边低声嘀咕。
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2.The old man muttered to himself about the weather.
老人自言自语地谈论天气。
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3.They muttered among themselves about the unfairness of the situation.
他们私下里议论这个不公平的情况。