say (sth), in a low voice not meant to be heard; grumble in an indistinct voice
a sound of muttering
"she grumbles when she feels overworked"
Muttering cautiously with downcast eyes.
出自: J. Conrad
你是在咕咕哝哝地对我说威胁话吗?
他不停地喃喃自语。
She muttered away in the dream.
她在梦中咕咕哝哝地抱怨。
她不停地喃喃自语。 mutter sth to sb
She muttered a few words to us.
她低声地抱怨了我们几句。