a fish out of water

US /ə fɪʃ aʊt əv ˈwɔtər/
UK /ə fɪʃ aʊt əv ˈwɔtər/
"a fish out of water" picture
1.

离水的鱼, 格格不入

a person who is in an unfamiliar or uncomfortable environment

:
When I moved to the big city, I felt like a fish out of water.
当我搬到大城市时,我感觉自己像一条离水的鱼
He was clearly a fish out of water at the formal dinner party.
在正式晚宴上,他显然像一条离水的鱼