wall of silence

1. The police say they met the usual wall of silence
   警方称他们像往常一样碰了壁，没人吭气。
2. The officials maintained a wall of silence around the talks.
   官员们对于会谈情况保持缄默。
3. To break down the wall of silence, parents should crate chances to understand what their children want to say, and try to find ways to talk and write to them.
   为了打破沉默之墙，家长们应制造机会来了解他们想说什么，并设法找出办法来与他们交谈，并写信给他们。
4. The investigators were confronted by a wall of silence.
   调查人员碰了壁，谁也不回答他们的问题。
5. A wall of silence surrounded the defence ministry prior to the attack.
   进攻之前，国防部保持缄默。

noun

1. the secrecy of police officers who lie or look the other way to protect other police officers
   1. the blue wall cracked when some officers refused to take part in the cover-up

   Synonym:    blue wall of silenceblue wall