点击下方单词,选择对的这个单词
及物动词
不及物动词
1. 咕哝;含糊地说If you mumble, you speak very quietly and not at all clearly with the result that the words are difficult to understand.
1. a soft indistinct utterance
多通过句子记忆单词，而不是单独死记硬背。
