Keep mum 保持沉默 ; 保持缄默 ; 闭口不说 ; 钳口不言
keep mum about something 对某事保持沉默
keep mum about sth 不说起某事
You just keep mum about it.
你就保持沉默。
youdao
It don't make any difference what happens, we got to keep mum.
不管发生什么事，我们守口如瓶都一直不会变。
Tom, we got to keep mum.
汤姆，我们得守口如瓶。
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