嘀咕地说出

例句：

1. 1. She muttered under her breath as she walked past the window.
   她边走边低声嘟囔。
2. 2.He muttered a few words to himself before leaving the room.
   他离开房间前低声自言自语了几句。
3. 3. The old man muttered about his long-forgotten dreams.
   老人低声谈论着他早已遗忘的梦想。