the elephant in the room
US /ðɪ ˈɛlɪfənt ɪn ðə ruːm/
UK /ðɪ ˈɛlɪfənt ɪn ðə ruːm/

1.
房間裡的大象, 顯而易見卻無人提及的問題
an obvious problem or difficult situation that people do not want to talk about
:
•
Everyone knew about the company's financial troubles, but no one dared to address the elephant in the room.
所有人都知道公司的財務困境,但沒人敢提及房間裡的大象。
•
Their strained relationship was the elephant in the room during the family dinner.
他們緊張的關係是家庭晚餐時房間裡的大象。