Secretary of State Hillary Clinton three weeks ago authorized U.S.diplomatic missions to invite Iranians to the July 4th observances, which typically include outdoor hot dog roasts and American music, as a goodwill gesture.

VOA: standard.2009.06.24

We just launch the site three weeks ago.

我们三周前才开放了网站。

麻省理工公开课 - 媒体、教育、市场课程节选

So we had two weeks like about... Three weeks ago, we had like a big heat spell.

所以我们已经有两个星期像这样了……三个星期前，我们有一个持续高温的时期。

关于伦敦的天气 - SpeakingMax英语口语达人

They started meeting three and a half weeks ago.

VOA: special.2010.06.03

That's something we've mentioned already three weeks ago, two weeks ago, we're going to take that fix now, we're going to assume you know who these candidates are.

我们在三周或两周前已经提到过,现在来讲一下这种情况,我们假设你们知道这些候选人是谁

耶鲁公开课 - 博弈论课程节选