点击下方单词,选择对的这个单词
1. 失眠的時候做什麼：84. 做過最瘋狂的事情:...i don't know | 85. 失眠的時候做什麼:murmuring... | 86. 無聊的時候做什麼:walking around with no purpose
noun
1. a complaint uttered in a low and indistinct tone
Synonym: grumblegrumblingmurmurmuttermuttering
2. a low continuous indistinct soundoften accompanied by movement of the lips without the production of articulate speech
Synonym: muttermutteringmurmurmurmurationmussitation
多通过句子记忆单词，而不是单独死记硬背。
