We finished 15 minutes ahead of time.

我们提前15分钟完成。

《牛津词典》

Find out ahead of time what regulations apply to your situation.

提前弄清楚什么规定适合你的情况。

《柯林斯英汉双解大词典》

I think he made a tactical blunder by announcing it so far ahead of time.

我认为他如此提早宣布消息是犯了战术上的错误。

《柯林斯英汉双解大词典》

when I've been surprised. When we had like a surprise we got to go out to someplace very fancy, didn't really know what was going to happen ahead of time.

VOA: special.2010.02.08

But what's interesting with these cases is you couldn't have predicted ahead of time that they would be heroes.

但这些例子所表明的就是,你不可能提前预知,他们会成为英雄

耶鲁公开课 - 心理学导论课程节选

You are about to go off on Friday night to see these movies and let's allow some communication ahead of time.

现在你们约好了周五晚上一起看电影,你们可以先沟通一下

耶鲁公开课 - 博弈论课程节选

All students must sign up ahead of time and can't switch locations or tests.

WSJ: College Tests Get New ID Standards

Ideally, companies should begin grooming a replacement two to five years ahead of time.

WSJ: Alex Ferguson Exit Creates a Management Dilemma at Manchester United

Stamboulie advises you to prepare ahead of time for your announcement, both emotionally and practically.

FORBES: How to Quit With Class