After almost two weeks of nearly constant criticism from minority Republicans who said he wasn't speaking out strongly enough, President Obama received some praise from the Republican leader in the House of Representatives.

VOA: standard.2009.06.23

So, a couple of weeks ago we proposed to swap two integers, and we couldn't at the time.

那么，几周前，我们提出交换两个整数，然而在那时，我们办不到。

哈佛公开课 - 计算机科学课程节选