一、penultimate

Y is the penultimate letter of the alphabet.

Y是字母表中倒数第二个字母。

二、the last but one

I live in the last house but one in this lane.

我住在这条胡同里倒数第二家。

Jack was the last but one to arrive.

杰克是倒数第二个到达的。

三、the second to last

She never tells readers exactly how she feels about Tom until the second to last paragraph of the book.

她从未告诉读者她自己对于Tom的真实看法，直到这本书的倒数第二段。