elephant in the room不是房间里有大象，真实含义是是显而易见而又没人愿意讨论的问题。

【例句】
We all sat sipping our tea quietly, no one wanting to bring up the elephant in the room about Raj's breakup with his girlfriend.
我们都默默地坐着喝茶，没人愿意提起Raj和女友分手的事。

When it comes to management system updates, everyone is an elephant in the room.
说到管理制度更新的时候，大家都选择了视而不见。