The Elephant in the room

房間裡的大象 The Elephant in the room），是一句英文諺語，意指房間裡明明有隻大象，大家卻裝作沒看到，刻意忽略，甚至告訴自己不該看到。也就是比喻眾人故意忽視或刻意, 整個社區竟然裝作不知情.

指的是面對一個明顯存在的事實，大家卻都裝作不知道、不去戳破，避免麻煩。...

If you say there is an elephant in the ​room, you ​mean that there is an ​obvious ​problem or ​difficult ​situation that ​people do not ​want to ​talk about.