动词短语
中文翻译：嘟囔
同义词：
['murmur', 'murmur', 'mumble']
例句：
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1.She muttered to herself as she walked down the street.
她在街上走的时候低声自言自语。
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2. The old man muttered about his past life in the park.
老人在公园里低声谈论他的过去生活。
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3.He muttered a few words before leaving the room.
他离开房间前低声说了几句话。