三周前，发现癌已扩散到了他的肝脏。

Three weeks ago, it was discovered the cancer had spread to his liver.

《柯林斯英汉双解大词典》

这个计划三周前被国会关键性地否决了。

The plan was decisively rejected by Congress three weeks ago.

《柯林斯英汉双解大词典》

我们在大约三周前就已经发出了聚会邀请函。

We sent out the party invitations about three weeks ago.

youdao

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

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