九点二十用英语表达是:nine twenty;
nine:num. 九。
twenty:num. 二十; 二十几; 二十年代。

(图片来自网络侵删)
We have lived in the same house for twenty years.
我们在同一座房子里住了二十年了。
I was twenty years old and ready for anything.
我当时二十岁,什么都愿意去做。
Twenty guests are enough, I would have thought.
我觉得二十位客人就够了。
They met again after a gap of twenty years.
他们阔别二十年后又见面了。
So that's twenty of each sort, right?
那么,每一种都是二十个,对不对?
The remaining twenty patients were transferred to another hospital.
其余的二十名病人被转送到另一家医院去了。