Use a period at the end of the sentence.

在一个子的末号。

After negotiation, they tacked two new clauses on to the end of the contract.

通过协商, 他们在合同末处又加上两项新条款。

There's an unusual twist to the plot at the end of the book.

在这本书的末, 情节发生不寻常的转折。

I was glad to see that the bad guy got his comeuppance at the end of the movie.

我很高兴看到电影末坏人受到应有的惩罚。