constant mussitation 持续的喃喃自语
muttering and mussitation 嘀咕与喃喃自语
low mussitation 低声细语
A: Do you hear that strange mussitation coming from the next room?
A：你听到隔壁房间传出的那种奇怪的喃喃自语声了吗？
B: I can't tell, it sounds more like a soft mussitation than actual words.
B：我也不确定，听起来更像是低声细语，而不是具体的词语。
1) 低声说话或嘟囔
2) 说话含糊不清
3) 喃喃自语的行为
1. 喃喃自语；低声嘀咕
noun
1. The act of muttering or speaking in a low, indistinct manner.
Synonym: muttering, murmuring, mumbling