点击下方单词,选择对的这个单词
及物动词
不及物动词
名词
1. 抱怨;发牢骚If someone grumbles, they complain about something in a bad-tempered way.
1. a complaint uttered in a low and indistinct tone
Synonym: grumblingmurmurmurmuringmuttermuttering
2. a loud low dull continuous noise
e.g. they heard the rumbling of thunder
Synonym: rumblerumblinggrumbling
多通过句子记忆单词,而不是单独死记硬背。