You must keep quiet in the library.

你在图书馆里应该保持安静。

youdao

We must keep quiet.

我们必须保持安静。

youdao

You must keep quiet at school library.

你在学校图书馆必须保持安静。

youdao

Mr Kuchma gives his consent, and adds that the Jordanian must be made to keep quiet about the deal.

BBC: Analysis: From West's favourite to pariah

Ms Campbell said the child's mother and grandmother had wondered what Mr McCarney must have done to keep Millie quiet.

BBC: Millie Martin's mother 'angry and distraught'

When the guy pushed me to the floor and said stay down, keep quiet, that's when I realised there must be some kind of terrorist attack.

BBC: Mumbai shootings: Eyewitnesses