be as silent as the grave be as close as an oyster keep one's tongue between one's teeth maintain a discreet silence
keep one's tongue between one's teeth
maintain a discreet silence
缄口不语用英文怎么说
缄口无言用英文怎么说
缄默用英文怎么说
缄默不言用英文怎么说
缄默不语用英文怎么说
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