"muttered" in Chinese (Simplified)
低声嘀咕
Definition
用低沉、难听清的声音说话，常常因为恼火或者不想让别人听到。
Usage Notes (Chinese (Simplified))
常见于非正式语境或故事中，表达不满、害羞或不想被听到时。常与“低声”、“生气地”、“自言自语”连用。不是普通的小声说话，通常有隐秘或烦躁的含义。
Examples
He muttered something under his breath.
他**低声嘀咕**了几句。
She muttered an apology and walked away.
她**低声嘀咕**着道了歉然后走开了。
The man muttered angrily at the noise.
那个人因噪音**低声嘀咕**着生气。
I barely heard what she muttered as she left the room.
她离开房间时我几乎没听清她**低声嘀咕**了什么。
He muttered to himself all through the meeting.
他整个会议期间都在**低声嘀咕**自言自语。
"This is ridiculous," she muttered under her breath.
“这太荒唐了。”她**低声嘀咕**着。