בסוף 用英语:

He stayed for three hours but at the end he left after eating all the food.

There's a full stop at the end of a sentence.

They are at the end of their food supply.

The bathroom is at the end of the corridor.

He dies at the end of the book.

And, at the end of that analysis we must make a recommendation to the investor about which company is the better buy

at the end of the meeting

I'm going to Madrid at the end of the month.