"doesn't know his ass from a hole in the ground" in Chinese (Traditional)
Definition
這是一種非常粗魯和侮辱性的說法，用來形容某人完全對重要或基本的事情一竅不通，完全不了解。
Usage Notes (Chinese (Traditional))
極其粗魯和侮辱性的表達，通常只會在好友間的玩笑或文學/影劇作品中出現。絕不可在正式場合作用。經常用來批評某人在某領域完全不懂。
Examples
People say he doesn't know his ass from a hole in the ground when it comes to computers.
大家說他在電腦方面**一竅不通**。
My uncle doesn't know his ass from a hole in the ground about cars.
叔父さんは車のことは**一竅不通**。
I'm sorry, but he doesn't know his ass from a hole in the ground in this subject.
抱歉，但他這個課題**一竅不通**。
Honestly, that guy doesn't know his ass from a hole in the ground when it comes to fixing things.
說真的，那傢伙修東西時**毫無頭緒**。
She acts confident, but she doesn't know her ass from a hole in the ground about business.
她看起來很有自信，但做生意方面**毫無頭緒**。
You'd think after all these years he'd get it, but he doesn't know his ass from a hole in the ground.
你會以為這麼多年下來他會懂，可他還是**一竅不通**。