You must keep silent about the matter.
你必须对此事保持沉默。
You'd better keep silent about what has happened.
你最好对所发生的事不要做声。
I've known since last summer — and agreed to keep silent about — the arc of her story.
早在去年夏天，我就知道了她的故事梗概，但我一直信守保持沉默的承诺。
I've known since last summer — and agreed to keep silent about — the arc of her story.
早在去年夏天，我就知道了她的故事梗概，但我一直信守保持沉默的承诺。
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