K-3:keep one's mouth shut 不要张扬
A:You look scared today. What's wrong with you?
A:今天你看上去很惊恐，怎么了？
B:The criminal told me to keep my mouth shut.
B：罪犯告诉我不许声张。
A:Criminal? What do you mean? Didn't you run into...
A:罪犯？你什么意思？难道你遇到了……
B:A robbery. The robber threatened to kill me if I told anyone about him.
B：一宗抢劫案，抢劫犯威胁说，如果我告诉任何人有关他的事，他就加害于我。
A:Don't be afraid. Let's call the police. They'll help us.
A:别害怕，咱们给警察打个电话，他们会帮助处理这件事的。
