"12" in Engpsh is pronounced as "twelve".
The origin of the word "twelve" comes from the Old Engpsh word "twelf" and the Proto-Germanic word "twapf". It has remained relatively unchanged in Engpsh for centuries.
Example sentences:
I have twelve apples in my basket.
(我的篮子里有12个苹果。)
The clock shows twelve o'clock.
(钟表显示是12点。)
He is twelve years old.
(他12岁了。)