to mutterto mumble complaintsto grumble
... bunchclusterclassifier for bunched objectsto hang down in a bunchto droop 嘟哝 to mutterto mumble complaintsto grumble 嘟哝不平 to constantly complain (idiom) ..
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to mutterto mumble complaintsto grumble
嘟哝;咕哝;抱怨
以上为机器翻译结果，长、整句建议使用 人工翻译 。