mumble

1. V-T/V-I If you mumble, you speak very quietly and not at all clearly with the result that the words are difficult to understand. 咕哝

Her grandmother mumbled in her sleep. 她祖母睡觉时咕哝了。

He mumbled a few words. 他咕哝了几句。

2. N-COUNT Mumble is also a noun. 咕哝

He could hear the low mumble of Navarro's voice. 他能听到纳瓦罗的低声咕哝。