it's all Greek to me

US /ɪts ɔl ɡriːk tu mi/
UK /ɪts ɔl ɡriːk tu mi/
"it's all Greek to me" picture
1.

我完全看不懂, 完全不懂

something that is incomprehensible or unintelligible to someone

:
I tried to read the instruction manual, but it's all Greek to me.
我试着读了说明书,但我完全看不懂
When they started talking about quantum physics, it was all Greek to me.
当他们开始谈论量子物理时,我完全听不懂