no idea
01
不知道, 完全没有头绪
used to express complete lack of knowledge or understanding about a particular topic, question, or situation
例子
No idea, I was out all afternoon.
不知道，我整个下午都在外面。
to have no idea
01
to not know something or be unsure about it
Collocation例子
They had no idea that the store closed early yesterday.
