not a/not onenot any person or thing 没有一个 Not one of the students knew the answer. 没有一个学生知道答案。
There wasn’t a cloud in the sky. 天空万里无云。
Not a single person said thank you. 没有一个人说谢谢。
not a/not one• But not a one of them was able to stay awake through the night, so they all were beheaded.• This change is not a one way process.
→ not a/not one at not(2)