you could have heard a pin drop

something that you say in order to describe a situation where there was complete silence, especially because people were very interested or very surprised by what was happening

为了描述环境之安静，你会用到这个说法，尤其是因为发生了一些让人感兴趣或惊讶的事情所导致时;(因着迷或惊讶而)鸦雀无声

Margaret's ex-husband turned up at the wedding. Honestly, you could have heard a pin drop.

玛格丽特的前夫出现在婚礼现场。老实说，当时全场真是鸦雀无声