I was planning to ask you in for a brandy, but if you want to take a rain check, that's fine.

我本想请你来喝杯白兰地，但如果你想改日再来，也行。

《柯林斯英汉双解大词典》

In China, you can vote and learn to drive a car when you are 18, but if you want to get married, women have to wait until they are 18 and men until they are 22.

在中国，你18岁就可以选举和学开车，但如果你想结婚，女性得等到18岁，男性得等到22岁。

youdao

But if you want to take things further.

但如果你想要更深的资讯。

youdao

But if you want to visit the newly opened Statue of Liberty, you must do it within the next two years.

VOA: special.2009.06.29

But if you want to know the answer, and I knew it, but I forget what it is-- it doesn't matter.

如果你想知道答案,我曾经是知道答案的,不过我忘掉了,这不重要

耶鲁公开课 - 心理学导论课程节选

But if you want to use other translations,that's fine.

但如果你想用其他译本，也可以。

耶鲁公开课 - 新约课程节选

But if you want to look cool while treating your feet to bliss, get a pair.

FORBES: Magazine Article

But if you want to light up in a festival tent at Cologne's carnival, no problem.

NPR: Germany Deals with New Smoking Regulations

But if you want higher property taxes or no projects funded, then vote for Dr. Hayworth.

FORBES: New York's 19th Gets the General Welfare Clause Right