be silent about

• 对 ...
• 保持缄默
• 对 ... 只字不提

be silent about的用法和样例：

例句

1. The shipping company will be liable for damage.
   运输公司将对损坏负责。
2. To be plain with you, I know nothing about it.
   坦白对你讲，我对此一无所知。

1. The officials maintained silence about the talks.
   官员们对于会谈情况保持缄默。
2. Kirchofer duly kept mum about her sexual orientation at work.
   在公司里，科奇弗乖乖地对自己的性倾向保持缄默。