they stood dumb while the attacker poured out a stream of abuse
同义词：
speechlesstongue-tiedwordlesssilentat a loss for wordsvoicelessinarticulatetaciturnuncommunicativeuntalkativetight-lippedclose-mouthedsaying nothinginformal：mum
2
(of a computer terminal) able only to transmit data to or receive data from a computer; having no independent processing capability.
动词
1
make dumb or unheard; silence.
a splendor that dazed the mind and dumbed the tongue
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dumb的示例
they stood dumb while the attacker poured out a stream of abuse
