一竅不通，意思是指沒一竅是貫通的，比喻一點兒也不懂（be utterly^{1 ignorant of）。可以翻譯為its all Greek to somebody，all Greek to me是英文慣用語，比喻something is not understandable。}

例句：

你弄懂這類說明了嗎？我根本一竅不通！

Can you make sense of these instructions? Its all Greek to me!

對不起，我不了解你說的是什么，我對那一竅不通。

Sorry, I dont understand what you said. It is Greek to me.