a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech
同义词：mutter??/??muttering??/??murmuring??/??murmuration??/??mussitation
a schwa that is incidental to the pronunciation of a consonant
同义词：murmur vowel
an abnormal sound of the heart; sometimes a sign of abnormal function of the heart valves
同义词：heart murmur??/??cardiac murmur
a complaint uttered in a low and indistinct tone
同义词：grumble??/??grumbling??/??murmuring??/??mutter??/??muttering
speak softly or indistinctly
make complaining remarks or noises under one's breath
同义词：mutter??/??grumble??/??croak??/??gnarl
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。